Orr 255 
Orr continues in these words: “The co-ordination 
of forces which determines development is not to be 
considered a definite, localized mechanism, wound up, 
and ready to go when touched. If such were the case 
we ought to find one such mechanism allotted to a cer- 
tain definite number of cells; but instead we find that 
each piece (of a hydra), regardless of the number of 
cells, or whether it be the half or the twentieth of the 
hydra, is capable of producing only one new individual.” 
“The quality upon which development depends seems 
to reside in a small piece just as well as in a large piece 
and moreover equally in all parts.” 
“T think we can best compare the inheritance of the 
plan and potentiality of development in the clump of 
protoplasm to inherence of ideas and potentialities of 
volition in the brain substance, not as though each idea 
and potentiality were located there in its own minute 
definite limited space, and attached to a definite mechan- 
ism of matter; but rather we should think of development 
and mental potentialities as dependent upon certain states 
of living matter, which states are the result of the entire 
past history of that living matter and which thus deter- 
mine the method of response to external stimuli, and the 
direction which shall be taken by the new energy con- 
stantly entering from the outside.” 1% 
This recalls again the above mentioned conception of 
Nageli and Hertwig of idioplasm which is both general 
and mnemonic, with all its short-comings which consist 
in complete indefiniteness or worse yet in lack of content 
masked by empty words. 
Nevertheless it is worthy of notice that however 
192Orr: Ibid. P. 172—173. 
