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bers, may possibly account for this; but he mentions another fact which is not so easily explicable. The fibres of the tendons of the long dorsal muscle taken from various animals, are used for thread by the Caffres and Hottentots, and that made from wild animals is much stronger than that which is made from tame[1] ones. It might have been supposed that if any difference existed, the fibres of a beast used for draught would have been the toughest.

166. Filtering Apparatus.

The simplest and most expeditious mode of filteration is one which Dr. Lind has described. Let a barrel with its head knocked out, be about half filled with clean sand or gravel; place a much smaller barrel without either end, or any open cylinder, upright in the middle of it, and let this be almost

  1. Travels in Africa, p. 29.