Serpent Psychology an Unplowed Field. At this date (1922) we know only the rudiments of serpent intelligence and temperament. In the wilds, serpents are most elusive and difficult to determine. In captivity they are passive and undemonstrative. We do not know how much memory they have, they rarely show what they think, and on most subjects we do not know where they stand. But the future will change all this. During the past twenty years the number of herpetologists in the United States has increased about tenfold. It is fairly impossible that serpent psychology should much longer remain unstudied, and unrevealed along the lines of plain common- sense. The Ways of Crocodiles. The ways of crocodiles are dark and deep; their thoughts are few and far between. Their wisdom is above that of the tortoises and turtles, but below that of the serpents. I have had field experience with four species of crocodilians in the New World and three in the Old. With but slight exceptions they all think alike and act alike. The great salt-water crocodile of the Malay Peninsula and Borneo is the only real man-eater I ever met. Except under the most provocative circumstances, all the others I have met are practically harmless to man. This includes the Florida species, the Orinoco crocodile, the little one from Cuba, the alligator, the Indian gavial and the Indian crocodile (_C. palustris_). The salt-water crocodile, that I have seen swimming out in the ocean two miles or more from shore, is in Borneo a voracious man- eater. It skilfully stalks its prey in the murky rivers where Malay and Dyak women and children come down to the village bathing place to dip up water and to bathe. There, unseen in the muddy water, the monster glides up stealthily, seizes his victim by the leg, and holding it tightly backs off into deep water and disappears. The victims are drowned, not bitten to death. I found in Ceylon that the Indian crocodile is a shameless cannibal, devouring the skinned carcasses of its relatives whenever an opportunity offered.