24 But there are actvM operations 



two are anatomically entirely distinct. But 

 it is something to the point to note, as 

 Cope did years ago, that there is at least 

 one case of a very precise connexion between 

 two distinct tissues which is perhaps quite 

 as wonderful as the connexion between 

 body-plasm and germ-plasm and hardly less 

 mysterious — viz. the adjustment of skin- 

 colouration to ground-surface brought about 

 through the organs of sight. Of this the 

 chameleon furnishes the most familiar but 

 not the most impressive instance. I came 

 the other day across an account of some 

 experiments that seem clearly to imply 

 the intervention in some way of conscious- 

 ness, in bringing about this adjustment — 

 an intervention which Cope surmised but 

 could not prove. Into a tank of flat fish, 

 whose colour matched its sandy bottom, a 

 nmnber of pebbles of a different colour 



