BY 
ditic 
degree of maturation, and may again 
Botany and Zoology. 133 
a female ovum, in the second a male ovam. The turning moment (mo- 
ment de vire), according to the author, is the time (probably very short) 
ae 2, being common to animals and plants, must be subjected 
10 identical fundamental laws in both kingdoms.” If this be true of the 
: Wh 
tions by which these same laws are realized in combination. 
he second and third parts of Mr. Thury’s memoir are here reproduced 
re, 
enti 
a4 parat lea 
Single generative period (multiparous and oviparous animals in general 
and ovi ) 
the first ova are generally the least developed, and produce females; the 
ast are more mature, and furnish malss. But if it happens that a second 
Benerative peri . the first one, or if the external or organic con- 
change considerably, the last ova may not attain to the superior 
in furnish females. 
