1891-92.] An Observation on Mind in Molluscs. 39 



Garden at Easter Duddingston Lodge." This paper has now 

 been privately printed, illustrated by portraits, and by views 

 in the well-known garden of the late Mr Charles Jenner, 

 from photographs by Mr Swan Watson, Edinburgh. A copy 

 of the paper has been presented to each member of the 

 Society, in remembrance of Mr Jenner, who was one of the 

 oldest members of the Society, and of Mr Gorrie, one of its 

 early Presidents, and who planned and laid out the garden at 

 Easter DuddinQston. 



X.— AN OBSERVATION ON MIND IN MOLLUSCS. 



By Mr WM. C. CEAWFOED, M.A. 



(Read April 27, 1892.) 



One evening last summer I had some fish heads boiled to 

 make a clear soup. The soup was made in order to putrefy, 

 and so give rise to new forms of life — for " putrefaction arises 

 from life, not from death." I wanted to observe the different 

 races of bacteria and monads which appear in succession dur- 

 ing the course of many months in putrefying decoctions, and 

 I used fish soup as a very suitable substance to employ for 

 that purpose. 



When my bowl of soup was still steaming, I placed it out- 

 side in the garden to cool. It may have remained there half 

 an hour or more, when I was surprised to notice that a brown 

 slug had climbed up the outside of the bowl and down the 

 inside, and was imbibing the juice copiously ; at the same time 

 a shell-bearing snail was making its way up outside the bowl. 

 Very soon this second mollusc had got down to the fish juice 

 and partook of it, apparently with great zest. I now noticed 

 a similar snail, about two feet away, coming down a wall and 

 directing its course straight to the bowl. In a quarter of an 

 hour or so this third mollusc had reached the attractive juice. 

 By this time the first slug had so gorged itself that, after 

 breaking out into a copious perspiration, it fell into the soup 



