Chap. I. THEIR SENSES. 33 



worms ; and it appears that they can dis- 

 tinguish between different varieties ; but this 

 may perhaps be owing to differences in their 

 texture. On eleven occasions pieces of the 

 fresh leaves of a common green variety and 

 of the red variety used for pickling were 

 given them, and they preferred the green, 

 the red being either wholly neglected or much 

 less gnawed. On two other occasions, how- 

 ever, they seemed to prefer the red. Half- 

 decayed leaves of the red variety and fresh 

 leaves of the green were attacked about 

 equally. When leaves of the cabbage, horse- 

 radish (a favourite food) and of the onion were 

 given together, the latter were always and 

 manifestly preferred. Leaves of the cab- 

 bage, lime-tree, Ampelopsis, parsnip (Pasti- 

 naca), and celery (Apium) were likewise 

 given together; and those of the celery 

 were first eaten. But when leaves of cab- 

 bage, turnip, beet, celery, wild cherry and 

 carrots were given together, the two latter 

 kinds, especially those of the carrot, were 

 preferred to all the others, including those 

 of celery. It was also manifest after many 

 trials that wild cherry leaves were greatly 



D 



