bused on the principle of Cephalization.—Herbivores, 177 
cies, and of fatty, cellular and dermal tissues mainly, in species 
of a feebler life-system. But when the control is less complete, 
the parts of the bony structure increase in length by amplifica- 
tion, especially the more circumferential portions of them—this 
amplificating tendency increasing in amount with the distance from 
the systemic centre or centres—and the structure is long-amplificate. 
With a feebler life-system, not able to keep the structure evolved 
to type-perfection, the limbs may have lax or imperfect extremi- 
ties, that is, lax as compared with their condition in the typigal 
Species under the t 
2. Definiteness of the distinction of gross-amplificate and long-am- 
plificate—It has been observed that the two higher groups of 
terrestrial _Herbivores are distinguished, the first, by being very 
generally gross-amplificate in the structures included, and the 
second by being long-amplificate, and that the two groups are 
thus quite well separated, there being but few cases of long- 
amplification in the former, and the gross-amplification in the 
latter taking place upon long-amplificate structures. It is a 
force, 
to which the above, relating to amplification, is actually subordi- 
8 
The separateness of th © powers is also illustrated by the arrest of devel- 
oo in The brain, in Seventh shown by fewer gyri and a greater simplicit 
of folds, while there is an increase of size up to normal dimensions, See W.C. 
Minor's translation of articles by Dr. Wagner, in this Journal [2], xxxiv, 188, and, 
; ilar, the remark of Dr. Minor on this pofat, on p. 199. 
* 
