husband gets so lean that, on the sudden lowering of the temperature that often occurs after a fall of rain, he is benumbed and dies." [Illustration: THE TOK (_Rhynchaceros erythrorhynchus_).] Dr. Livingstone also gives the following interesting anecdote illustrative of the affection of these birds to their mates:--"Near sunset, on the 25th of August" (he writes from Dakanamoio Island), "we saw an immense flock of the largest species of Hornbills (_Buceros cristatus_) come here to roost on the great trees which skirt the edge of the cliff; they leave early in the morning, often before sunrise, for their feeding-places, coming and going in pairs. They are evidently of a loving disposition, and strongly attached to each other, the male always nestling close beside his mate. A fine male fell to the ground from fear at the report of Dr. Kirk's gun; it was caught and kept on board. The female did not fly off in the mornings to feed with the others, but flew round the ship, anxiously trying, by her plaintive calls, to induce her beloved one to follow her. She came again in the evenings to repeat the invitation; the poor disconsolate captive refused to eat, and in five days died of grief because he could not have her company. No internal injury could be detected after death." * * * * * The SMOOTH-BEAKED HORNBILLS (_Rhynchaceros_) are the smallest members of this extensive group. In these birds the beak, which is comparatively small, has both mandibles curved, and the margins more or less denticulated; the feet are short and weak; the wings, in which the fourth or fifth quill is the longest, are of medium size, and the slightly-rounded tail of moderate length. THE TOK. The TOK (_Rhynchaceros erythrorhynchus_), a species inhabiting a large portion of Africa, is of a reddish grey upon the mantle and dirty white on the under side; the head and throat are greyish white; the wing-covers black, spotted with yellowish white on the inner web, with the exception of the innermost, which is white on the outer and brownish grey on the inner web; the two centre tail-feathers are a dull grey, the rest are black and white. The eye is deep brown, the beak blood-red, with a dark patch at the base of the lower mandible, the feet are brownish grey. This species is seventeen inches and three-quarters long, and twenty-two broad; the wing measures six inches and a half and the tail seven inches and a half. The female is similarly coloured, but considerably smaller than her mate.