My father once owned a cow who contracted a strong affection for my sister. This cow, who showed on many occasions and in many ways her highly developed emotional nature, would scarcely allow anyone else than my sister to milk her. She always presented herself to my sister as soon as she was let into the lot in order to be milked first, and she was so jealous of this privilege that if it were not accorded to her she would stand with her head down and give vent to her unhappiness in low moans. After she was milked she would follow her human friend around from one cow to another, in order to be as near her as possible. She knew my sister’s voice from that of everyone else, and would always low a response and come to her when called by name, even though she were a quarter of a mile away in the pasture. Romanes tells somewhere of a band of apes that were being pursued by dogs when a young ape was cut off from the rest and was about to be killed by the dogs. The chief of the band, seeing the peril of the young one, went deliberately back and rescued it. Many animals show that they possess a rudimentary sense of humour by the pranks and tricks which they play on each other and on human beings. The monkey is the prince of nonhuman jokers, but dogs, cats, horses, elephants, and other animals have enough of this sense to have books written about it. A monkey has been observed to slyly pass his hand back of a second monkey and tweak the tail of a third one, and then composedly enjoy himself while the resentment of the injured monkey expended itself on the innocent middle one. Many monkeys enjoy entertaining their friends with grimaces, by carrying a cane, putting a tin dish on their heads, or other droll antics. These intelligent animals have a sufficiently high appreciation of the ludicrous to dislike ridicule. Like human beings, they can’t endure being laughed at, and get mad if they are made the victims of a joke. Romanes’ monkey was one day asked to crack a nut for the amusement of a visitor. The nut turned out to be a bad one, and the melancholy look of disappointment on the monkey’s face caused the visitor to laugh. The insulted monkey flew into a rage, and hurled the nut at the offending scoffer, then the hammer, and finally the coffee-pot which simmered on the grate fire.[1] Darwin tells of a baboon in the Zoological Gardens of London who always became infuriated every time his keeper took out a letter or book and read aloud to him. On one occasion when Darwin was present the baboon became so furious that he bit his own leg until it bled.[4]