Part 19 (1/2)
Tea made in tin mugs.--A correspondent a.s.sures me that he considers the Australian plan of making tea to be preferable to any other, for travellers and explorers; as it secures that the tea shall be made both well and quickly, and without the necessity of carrying kettles on horseback. Each person has a common tin quart pot and a pint pot, slung to his saddle; the tea and sugar are carried in small bags. The quart pot requires very little fire to make it boil. When it begins to boil, it is taken from the fire, the tea is dropped in, and the pint pot is placed on its top as a cover. When the tea is ready, the sugar is dropped into the pint, and the tea is poured from one pot to the other till it is mixed.
The pint is always kept clean for drinking out of, but not the quart, for the blacker it is, the sooner will the water boil.
Tea made over night.--To prepare tea for a very early breakfast, make it over night, and pour it away from the tea-leaves, into another vessel. It will keep perfectly well, for it is by long standing with the tea-leaves that it becomes bitter. In the morning simply warm it up. Tea is drunk at a temperature of 140 degrees Fahr., or 90 degrees above an average night temperature of 50 degrees. It is more than twice as easy to raise the temperature up to 140 than to 212 degrees, letting alone the trouble of tea-making.
Extract of Tea and Coffee.--Dr. Rae speaks very highly of the convenience of extract of tea. Any scientific chemist could make it, but he should be begged to use first-rate tea. The extract from first-rate tea makes a very drinkable infusion, but that from second-rate tea is not good, the drink made from the extract always a grade inferior to that made directly from the leaves. By pouring a small quant.i.ty of the extract into warm water, the tea is made; and, though inferior in taste to properly made tea, it has an equally good effect on the digestion.
Extract of coffee is well known. I believe it can be made of very good quality, but what is usually sold seems to me to be very much the contrary and not to be wholesome.
Tea and Coffee, without hot water.--In Unyoro, Sir S. Baker says, they have no idea of using coffee as a drink, but simply chew it raw as a stimulant. In Chinese Tartary, travellers who have no means of making a cup of tea, will chew the leaves as a subst.i.tute. Mr. Atkinson told me how very grateful he had found this makes.h.i.+ft.
WATER FOR DRINKING.
General Remarks.--In most of those countries where travelling is arduous, it is the daily care of an explorer to obtain water, for his own use and for that of his caravan. Should he be travelling in regions that are for the most part arid and rarely visited by showers, he must look for his supplies in ponds made by the drainage of a large extent of country, or in those left here and there along the beds of partly dried-up water-courses, or in fountains. If he be unsuccessful in his search, or when the dry season of the year has advanced, and all water has disappeared from the surface of the land, there remains no alternative for him but to dig wells where there are marks to show that pools formerly lay, or where there are other signs that well-water may be obtained.
Short Stages.--I may here remark that it is a good general rule for an explorer of an arid country, when he happens to come to water, after not less than three hours' travelling, to stop and encamp by it; it is better for him to avail himself of his good fortune and be content with his day's work, than to risk the uncertainty of another supply.
Purity of Watering-places.--Make no litter by the side of watering-places; and encourage among your party the Mahomedan feeling of respect for preserving the purity of drinking-water. Old travellers commonly encamp at a distance from the watering-place, and fetch the water to their camp.
Signs of the Neighbourhood of Water.--The quick intelligence with which experienced travellers discover watering-places, is so great that it might almost be mistaken for an instinct.
Intelligence of Dogs and Cattle.--Dogs are particularly clever in finding water, and the fact of a dog looking refreshed, and it may be wet, has often and often drawn attention to a pond that would otherwise have been overlooked and pa.s.sed by. Cattle are very uncertain in their intelligence. Sometimes oxen go for miles and miles across a country unknown to them, straight to a pond of water; at other times they are most obtuse: Dr. Leichhardt, the Australian traveller, was quite astonished at their stupidity in this respect.
Trees and ordinary vegetation are not of much help in directing a traveller to water, for they thrive on dew or on occasional rain; but it is otherwise when the vegetation is unusually green or luxuriant, or when the vegetation is unusually green or luxuriant, or when those trees are remarked, that are seldom seen to grow except near water in the particular country visited, as the blackthorn-tree in South Africa.
Birds.--Some species of birds (as water-fowl, parrots, and the diamond bird) or animals (as baboons) afford surer promise; but the converging flight of birds, or the converging fresh tracks of animals, is the most satisfactory sign of all. It is about nightfall that desert birds usually drink, and hence it often happens that the exhausted traveller, abandoning all hope as the shades of evening close in, has his attention arrested by flights of birds, that give him new life and tell him where to go.
Tracks.--In tropical countries that have rainy and dry Seasons, it must be recollected that old paths of men or wild animals only mislead; they go to dry ponds that were full at the time they were trodden, but have since been abandoned on becoming exhausted.
Other Signs.--Well-water may be sought where the earth is still moist, though arid all around, or, failing that, where birds and wild animals have lately been scratching, or where gnats hover in swarms.
To find the Spring--From the number of birds, tracks, and other signs, travellers are often pretty sure that they are near water, but cannot find the spring itself. In this case the party should at once be spread out as skirmishers, and the dogs cheered on.
To probe for Well-water.--It is unusual, when no damp earth can be seen, but where the place appears likely to yield well-water, to force an iron ramrod deep into the soil; and, if it bring up any grains that are moist, to dig.
Pools of Water.--For many days after there has been rain, water is sure to be found among mountains, however desert may be their appearance; for not only does more wet fall upon them, but the drainage is more perfect; long after the ravines and stream-beds are quite dry, puddles and cupfuls of water will be found here and there, along their courses, in holes and c.h.i.n.ks and under great stones, which together form a sufficiency. A sponge tied to the end of a stick will do good service in lapping these up.
The sandy Beds of Watercourses in arid countries frequently contain pools of stagnant water; but the places where these pools are to be found are not necessarily those where they have been found in preceding years. The conditions necessary for the existence of a pool are not alone those of the rocky substratum of the river-bed, but more especially, the stratifications of mud and clay left after each flooding. For instance, an extensive bed of sand, enclosed between two layers of clay, would remain moist, and supply well-water during the dry season; but a trivial variation in the force and Amount of the current, in different years, might materially affect the place and the character of the deposition of these clay strata.
In searching the beds of partly dried-up watercourses, the fact must never be forgotten, that it is especially in little tributaries at the point where they fall into the main one, that most water is to be found; and the most insignificant of these should never be overlooked. I presume that the bar, which always acc.u.mulates in front of tributaries, and is formed of numerous layers of alluvial deposit, parallel to the bed of the great stream, is very likely to have one, at least, of its layers of an impervious character. If so, the bar would shut in the wet sand of the tributary, like a wall, and prevent it from draining itself dry.
When a river-bed has been long followed by a traveller, and a frequent supply of water found along it, in pools or even in wells, say at every 5 or 10 miles--then, should this river-bed appear to lose itself in a plain that is arid, there is no reason why the traveller should be disheartened; for, on travelling further, the water will be sure to be found again, those plains being always green and gra.s.sy where the water in such river-beds entirely disappears.
By Sea-sh.o.r.e.--Fresh water is frequently to be found under the very sands of the sea-sh.o.r.e, whither it has oozed underground from the upper country, and where it overlies the denser salt water; or else abuts against it, if the compactness of the sand resists free percolation. In very many places along the skirt of the great African desert, fresh water is to be found by digging two or three feet.
Fountains.--Fountains in arid lands are as G.o.dsends. They are far more numerous and abundant in limestone districts than in any others, owing to the frequent fissures of those rocks: therefore, whenever limestone crops out in the midst of sand deserts, a careful search should be made for water. In granite, and other primary rocks, many, but small springs, are usually seen.
The theory of ordinary fountains is simple enough, and affords help in discovering them. In a few words, it is as follows:--All the water that runs from them has originally Been supplied by rain, dew, or fog-damp, falling on the face of the land and sinking into it. But the subsoil and rocks below, are far from being of a uniform character: they are full of layers of every imaginable degree of sponginess. Strata of clay wholly impenetrable by water, often divide beds of gravel that imbibe it freely.
There are also cracks that make continuous channels and dislocations that cause them to end abruptly; and there are rents, filled with various materials, that may either give a free pa.s.sage or entirely bar the underground course of water. Hence, when water has sunk into the earth, it does not by any means soak through it in an equable degree. It is an easier matter for it to ooze many miles, along a layer of gravel, than to penetrate six inches into a layer of clay that may bound the gravel.
Therefore, whenever a porous earth or a fissured rock crops out to the light of day, there is, in ignorance of all other facts, some chance of a spring being discovered in the lowest part of the outcrop. A favourable condition for the existence of a large and permanent fountain, is where a porous stratum spreads over a broad area at a high level, and is prolonged, by a gradually narrowing course, to an outlet at a lower one.