.] 71 
[Hyatt. 
show that they were probably identical. HaeckeP maintained 
the same dynamical hypothesis, and Professor Cope, who has 
been the oriii;inator and consistent supporter of dynamic theories 
in this country, has insisted upon the truth of this liypotliesis 
in two essays^ ; the following are quotations from the latter, 
"On inheritance in evolution." 
"If the doctrine of kinetogenesis be true, this energy [the 
building energy] has been moulded by the interaction of the 
living being and its environment. It is the expression of the ha- 
bitual movements of the organism which have become impressed 
on the reproductive elements. It is evidejit that these and the 
other organic units of which the organism is com])osed, possess 
a memory which determines their destiny in the building of the 
embryo. This is indicated by the recapitulation of the phylogen- 
etic history of its ancestors displayed in embryonic growth. This 
memory has perhaps the same molecular basis as the conscious 
memory, but for reasons unknown to us, consciousness does not 
preside over its activities. The energy which follows its guidance 
has become automatic, and it builds what it builds with the same 
regardlessness of immediate surroundings as that which is dis- 
played by the crystalline growth energy. It is incapable of a new 
design It appears to me that Ave can more readily conceive 
of the transmission of a resultant form of energy of this kind to 
the germ-plasma, than of material ])articles or gemmules. Such 
a theory is sustained by the known cases of the influence of ma- 
ternal impressions upon the growing foetus. Going into greater 
detail we may compare the building of the embryo to tiie un- 
folding of a record or memory, which is stored in the central 
nervous organism of the parent, and impressed in greater or less 
part on the germ-i)lasma in the order in which it was stored. 
The basis of memoi-y is reasonably supposed to be a molecular 
(or atomic) arrangement from which can issue only a definite 
corresponding mode of action. That such an arrangement exists 
in the central nervous organism is demonstrated by automatic 
and reflex movements." 
1 Die perigenesis der plastidule oder diu wellenzeiiguug dcr lobensUicilihcii. IJciliii, 
1876. 
■^ Amer. nat., v. 16, p. 454-469. 188-2; reprinted in tlie "Ongin of the littcst," p. 405- 
421, and '-Oa inheritance in evolution," Amer. nat., v. 2-\, p. 1058-1071, 1889. 
