112   Art of Travel.

Bark Cloth is used in several parts of the work. It is simply a piece of some kind of peculiarly fibrous bark ; in Unyoro, Sir S. Baker says, the natives use the bark of a species of fig-tree. They soak it in water and then beat it with a mallet, to get rid of all the harder parts;-much as hemp is prepared. " In appearance it much resembles corduroy, and is the colour of tanned leather : the finer qualities are peculiarly soft to the touch, as though of woven cotton."

Eyed rf colour on warmth of clothing.-Dark colours be

come hotter than light colours in the sunshine, but they are not hotter under any other circumstances. Consequently a person who aims at equable temperature, should wear light colours. Light colours are far the best for sporting purposes, as they are usually much less conspicuous than black or rifle-green. Almost all wild beasts are tawny or fawn-coloured, or tabby, or of some nondescript hue and pattern : if an animal were born with a more decided colour, he would soon perish for want of ability to conceal himself.

Warmth of different Materials.-" The indefatigable Rumford made an elaborate series of experiments on the conductivity of the substances used in clothing. His method was this :-A mercurial thermometer was suspended in the axis of a cylindrical glass tube ending with a globe, in such a manner that the centre of the bulb of the thermometer oocupied the centre of the globe ; the space between the internal surface of the globe and the bulb was filled with the substance whose conductive power was to be determined; the instrument was then heated in boiling water, and afterwards, being plunged into a freezing mixture of pounded ice and salt, the times of cooling down 135° Fally. were noted. They are recorded in the following table :

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