shut, and then live for a much longer time when taken out of the water."—Animal Intelligence, p. 25.
"These animals (snails) appear also susceptible of some degree of permanent attachment. An accurate observer, Mr. Lonsdale, informs me that he placed a pair of land-snails (Helix pomatia), one of which was weakly, into a small and ill-provided garden. After a short time the strong and healthy individual disappeared, and was traced by its track of slime over a wall into an adjoining well-stocked garden. Mr. Lonsdale concluded that it had deserted its sickly mate; but after an absence of twenty-four hours it returned, and apparently communicated the result of its successful exploration, for both then started along the same track, and disappeared over the wall."—Descent of Man, pp. 262, 263, quoted by Professor Romanes in Animal Intelligence, p. 27.
Both the oyster and the snail appear capable of acting, in however limited a degree, by virtue of acquired knowledge. That some insects possess this power to a great extent is evident from the fact that enslaved ants acquire mental traits vastly different from those exhibited by the free members of the same species. It should be noted that adult ants are never enslaved, the pupae alone being carried off, so that whatever traits the slaves acquire are acquired under the tuition of their masters.
