136 Facts Compelling Us to Reject Preformation 
side of the new animal or vice versa; and the development 
of the new pharynx which is found in the exact lon- 
gitudinal axis, indicates that it can be produced indiffer- 
ently from any part whatever of the old tissue.1° 
This remodeling of old tissues into new tissues differ- 
ing from them indicates that the supposed determinants 
of Weismann have not by themselves any value, for as 
soon as the tissue finds itself in conditions different from 
the normal ones it takes on forms and acquires properties 
which would require determinants of quite another nature. 
“The organism,” writes Whitman, “dominates cell forma- 
tion using for the same purpose one, several, or many 
cells, massing its material and directing its movements 
and shaping its organs as if cells did not exist or as if 
they existed only in complete subordination, if I may so 
speak, to its will.” 7°? And one would not know how to 
give any better proof of the correctness of this statement 
than that which is constituted by these particular regener- 
ations, which utilize the material already existing to 
remodel it into the new. 
And not only are these phenomena of peculiar regen- 
eration irreconcilable with preformation but the very fact 
of regeneration in general is irreconcilable with it. 
“The germ tissue of the new organ,” writes Hertwig, 
“does not contain any remnant of the amputated organ 
itself from which it could be reproduced by simple 
growth. The buds destined to reconstitute the eye-bear- 
108 M. Morgan: Experimental Studies on the Regeneration of 
Planaria maculata. Arch. f. Entwicklungsmech. d. Org. Bd. VII. 
Heft 2. and 3. Leipzig, Engelmann. Oct. 18, 1808. P. 385, 380, 305 
—306. 
*°Whitman: The Inadequacy of the Cell-Theory of Develop- 
ment. Biol. Lect. at the Mar. Biol. Lab. of Wood's Holl, Summer 
Session 1893. Bostcn, U. S. A., Ginn 1804. P. 119. 
