e 
134 Scientific Intelligence. 
eteris paribus, the secre of the principle of sexuality is Tess 
easy in the case of multiparous animals. 
5. In the application of the above principles to the larger Mantineliag 
it is necessary that the experimenter should first of all observe the course 
of the phenomena of heat in the very individual upon which he proposes 
to act, in order that he may know exactly the duration and the signs of 
the rutting-season, which fr uently 7 in different individuals. 
6. It is evident that no certain result can be expected when the signs 
of heat are vague or equivocal. This is acatvely ever the case in animals 
living in a state of freedom; but cattle in the fattening-sheds or in the 
stable sometimes present this abnormal peculiarity. Such animals must 
be excluded from experimentation 
7. From the mode in which the law ruling the production of the sexes 
has been deduced, it — a this law must be general and apply to 
all organized beings,—that to say, to plants, animals, and man 
It is necessary to distinguish carefully the law itself (1 and 2 of this 
summary), which is absolute, from the applications of it which may be 
made with more or less facility. 
Lhird Part—WNotice by Mr. George Cornaz.—lI, the —— 
Gohan administrator of the estate of my father, the late M 
Cornaz, Piesdatit of the Agricultural Society of “La Suisse Ro bine 
at Montet, in the Canton de Vaud, certify that I received from Mr. Thury, 
Professor in the Academy of Geneva, under date of the 18th February, 
1861, 2 stor confidential instructions the object of which was an expeti- 
cre | verification of the law which governs the production of sex im 
ing subsequently phi a cow of pure Durham we fiebet I ae- 
Sars to bikin from them a new bull, which might replace the one whieh 
Thad bought at great cost, without waiting for the chance of the 
of a male. I operated in accordance with the ee of Prof. eed 
and the success again nee ies the truth of the pro hich had been 
Communicated ¢ e—a process the application of aie is direct and 
es my Durham bull, I obtained six other bulls, of a cross-breed 
“sean the Durham and Schwitz, which I intended for work: noasie select- 
ing cows of the same color and size, I obtained very well-matched pairs 
bulls. 
ithe herd consists of forty cows of all 
To sum up, I have made in all twenty-nine experiments according to 
Ribiew cng lepemgt all have given the desi red product, male or female: 
oe no case of non-success. All the experiments were made by 
pony declare that I ‘rogard the method of Pro, Thu 
