270 
EDITORIAL. 
breeding establishment, he has noticed that, covered by a stallion 
which had not mounted any since several days before, the mares 
had only female products, while, on the contrary, mares covered 
by a stallion which had done service the day before gave birth to 
males. 
Having bought a bull and lending him to county people, it 
was observed that the products given by this bull, out of 156 
cows that he covered in two years, there were but two exceptions 
to the rule. 
And, says Ciesielski, I add that since thirty-three years, I 
have often had the possibility of experimenting this law in man, 
by giving to many relations, friends and even strangers disin¬ 
terested advices, whose essential object I did not reveal, but 
which I seemed to attach much importance. In all the cases 
where these advices were exactly followed, the result has always 
been what was expected. ,r 
Conclusions: The sexual differentiation takes place at the 
time of fecundation in plants, in animals and in man, and it takes 
place according to one single law, viz.: Fecundating elements 
(pollen or spermatozoids ), fresh , not more than twenty-four 
hours , give products of male sex; those elements more than 
twenty-four hours old promote the formation of female sex. 
If this theorv and this law are correct, breeders can derive 
^ * 
great advantage according to their desires. 
* 
* * 
Bibliography. — F Parasitologie dcs Animaux Domestiques ” 
(Parasitology of Domestic Animals), by Dr. Maurice Neveu- 
Lemaire, Professor at the Faculty of Medicine, Member of the 
Society of Veterinary Sciences of Lyon (Rhone). 
There are few sciences which have in late years made as 
extensive and rapid progresses as that of parasitology, and the 
publications that relate to it are day by day more numerous. The 
important studies and the new discoveries that have been made 
