Have you got the 'Contemporary Review' for June with my article on Darwinism? If not, I will send it. Another bit of work was an investigation into the intelligence of the chimpanzee 'Sally' at the Zoological Gardens, which the following letter describes: SAVAGE VERSUS BRUTE. _To the Editor of the 'Times'_ (_Sept. 19, 1888_). Sir,--In connection with the correspondence on the powers of counting displayed by savages, it may be of interest to narrate the following facts with regard to similar powers as displayed by brutes. One often hears a story told which seems to show that rooks are able to count as far as five. The source of this story, however, is generally found to have been forgotten, and therefore the story itself is discredited. Now, the facts stand on the authority of a very accurate observer, and as he adds that they are 'always to be repeated when the attempt is made,' so that they are regarded by him as 'among the very commonest instances of animal sagacity,' we cannot lightly set them aside. The observer in question is Leroy, and the facts for which he personally vouches in his work on animal intelligence are briefly as follows: 'The rooks will not return to their nests during daylight should they see that anyone is waiting to shoot them. If to lull suspicion a hut is made below the rookery and a man conceal himself therein, he will have to wait in vain, should the birds have ever been shot at from the hut on a previous occasion. Leroy then goes on to say: 'To deceive this suspicious bird, the plan was hit upon of sending two men into the watch-house, one of whom passed out while the other remained; but the rook counted and kept her distance. The next day three went, and again she perceived that only two returned. In fine, it was found necessary to send five or six men to the watch-house in order to throw out her calculation.'