THE EDUCABILITY OF A SNAIL _ 61 
before the shock or punishment was received. This 
looked like profiting by experience, but the snails 
showed no ability to utilize this in the further 
step of solving the labyrinth. Selective ability is 
apparently lacking. The interest of Miss Thomp- 
son’s admirably conducted investigation is partly in 
its ingenious methods, and partly in its demonstra- 
tion of the educability of a very unpromising sub- 
ject. Here we are on the threshold of a quality that 
especially marks brains not loaded with ready-made 
capacities of instinctive behavior, the quality 
which Sir Ray Lankester has called educability, the 
quality of being able to learn. 
