
154 REVIEWS. 
blood which is completely colorless, and contains only very few globules. 
The want of globules in the blood has its rise e an arrest of develop- 
= of the vascular area, which is only very imperfectly furnished with 
nals, and which sonda the blood globules mpi in the isles of 
Woif (iles de Wolf). 
‘ The inversion of the viscera results from the unequal development of 
of the cardiac arch more to the I of the embryo than the returning 9: 
the embryo (heart) upon the left s During inversion, the left cardiac 
blastema develops itself more rr id right, from which results the in- 
curvation of the cardiac arch to the left of the embryo, and the return 
e same upon the right side. The existence of two hearts, an anom- 
may ine 
er Gas indicated, the left region of the vascular area is more develope 
e right, and when, also, the temperature of the centre where w 
bation is effected, is relatively low. I have otherwise accumulated nu 
rous indications which will soon permit me, according to all nee 
to produce at will other anomalies. 
* I have made, also, many experiments in order to study the manner in 
which pe ae is carried on at temperatures above and below the nor- 
mal temperature of incubation. The high temperatures accelerate its 
progress, and — that diminution of stature which constitutes Nan- 
ismus. The low temperatures, on the contrary, considerably retard the 
th 
progress of development, a and do not permit the embryo to exist (depas- : 
ser) beyond a certain 
“Tt is also a Pein AREA Muro of my studies that = explain 
the absence of certain monstrosities in ce species by the differences 
. which these species present in their evolution. Thus the M of 
amnios appears to preserve the fishes from a great number of deformi- 
ties; the absence of the amnios and that of the cane vesicle equa 
mmunity.” 

appear to give to th 





