Art of Travel.
together, which, however, must be quite clean and free from grease, even the touch of the hand taints them. Sheets of horn are a well-known substitute for glass, and are made as follows:-The horn is left to soak for a fortnight in a pond; then it is well washed, to separate the pith ; next it is sawn lengthwise, and boiled till it can be easily split into sheets with a chisel ; which sheets are again boiled, then scraped to a uniform thickness, and set into shape to dry. Tortoiseshell and whalebone can be softened and worked in the same way.
To glaze Pottery.-Most savages have pottery, but few know how to glaze it. One way, and that which was the earliest known, of doing this, is to throw handfuls of salt upon the jar when red-hot in the kiln. The reader will doubtless call to mind the difficulties of Robinson Crusoe in making his earthenware water-tight.
Substitute for Clay.-In Damara land, where there is no natural material fitted for pottery, the savages procured mud from the interior of the white-ant hills, with which they made their pots. They were exceedingly brittle, but nevertheless were large and serviceable for storing provisions and even for holding water over the fire. I have seen them two feet high. What it was that caused the clay taken from the ant-hills to possess this property, I do not know.
Pots for Stores and Caches.-An earthen pot is excellent for a store of provisions or for a cache, because it keeps out moisture and insects, and animals cannot smell and therefore do not attack its contents.
CANDLES AND LAMPS.
Candles.-Moulds for Candles.-It is usual, on an expedition, to take tin moulds and a ball of wick for the purpose of making candles, from time to time, when fat happens to be abundant. The most convenient mould is of the shape shown in the figure. The tallow should be poured in, when its heat is so reduced that it hardly feels warm to the finger ; that is,