Inherited Memory. 15 



of tlio sportsman among the brown heather was acquired mechani- 

 cally. Moreover, Wallace distinctly shows that when the larvae are 

 made to pupate on unnatural colours, like sky-blue or vermilion, 

 the pupse do not mimic the colour. There is no reason why 

 " natural photography " should not copy this as well as the greens, 

 and browns, and yellows. But how easy the explanation becomes 

 when memory, the sense of need, and Butler's little "dose of 

 reason," are admitted ! For ages the butterfly has been acquainted 

 with greens, and browns, and yellows, they are every day experi- 

 ences ; but it has no acquaintance with aniline dyes, and therefore 

 cannot copy them. 



The moral of all this is that things become easy by repetition; 

 that without experience nothing can be done well, and that the 

 course of development is always in one direction, because the 

 memory of the road traversed is not forgotten. 



