is Scientific Intelligence. 
The second, which is shorter, contains, under the title of “‘ Résumé,” the 
complete exposition of the author’s notions. The third is a “Notice,” 
ared by Mr. Cornaz, in which this clever agriculturist describes the 
experiments which he has made, during two consecutive years, for the 
verification of the author’s theory, and by which this theory appears to 
feet 
to the animal kingdom. He refers, in the first place, to the fundamental 
that of a female. 
It remained to fix the precise moment at which this primary determi- 
nation of the sex takes place. This might be before fecundation, or 
uring, or after, this act. In the former case, if the fecundation were 
retarded, this retardation, permitting a more complete development of the 
the author also knew, from some previous experiments, that, in domestic 
poultry, the eggs last laid nearly always furnish the cocks of the clutch; 
and he thought it probable that the last eggs which detach themselves _ 
_ from the ovary of the fowl are those which have had the most time for 
during their passage through the upper part of the oviduct. 
here also, when the feeundation is retarded, ; are the result. 
by W.S, Dallas, F.L.S., from the abstract by Prof. Pietet iat, 
° Universelle,” September 20, 1863, p.91, for the Ann. Mag. Nat. Histy 
({3], xiii, 68), itishere cited. a 
fecundated, as all physiologists are aware, 
