ROMANES' MENTAL EVOLUTION, ETC. 53 



that they may be acquired as instincts by the here- 

 ditary transmission of ancestral experience." 



On another page Mr. Eomanes says : — 



"Let us now turn to the second of these two 

 assumptions, viz., that some at least among migratory 

 birds must possess, by inheritance alone, a very precise 

 knowledge of the particular direction to be pursued. 

 It is without question an astonishing fact that a 

 young cuckoo should be prompted to leave its foster 

 parents at a particular season of the year, and without 

 any guide to show- the course previously taken by its 

 own parents, but this is a fact which must be met by 

 any theory of instinct which aims at being complete. 

 Now upon our own theory it can only be met by 

 taking it to be due to inherited memory." * 



A little lower Mr. Eomanes says : " Of what kind, 

 then, is the inherited memory on which the young 

 cuckoo (if not also other migratory birds) depends ? 

 We can only answer, of the same kind, whatever this 

 may be, as that upon which the old bird depends." * 



I have given above most of the more marked pas- 

 sages which I have been able to find in Mr. Eomanes' 

 book which attribute instinct to memory, and which 

 admit that there is no fundamental difference between 

 the kind of memory with which we are all familiar 

 and hereditary memory as transmitted from one gene- 

 ration to another. But throughout his work there 

 are passages which suggest, though less obviously, the 

 same inference. 



The passages I have quoted show that Mr. Eomanes 

 * Mental Eyolution in Animals, p. 296. Nov. 1883. 



