72 Dr. G. C. Wallich on the Process of 
the chance of the birth of a-male. I operated in accordance 
with the directions of Prof. Thury, and the success again con- 
firmed the truth of the process which had been communicated 
to me—a process the application of which is direct and very easy. 
Besides my Durham bull, I obtained six other bulls, of a 
cross-breed between the Durham and Schwitz, which I intended 
for work: by selecting cows of the same colour and size, I ob- 
tained very well-matched pairs of bulls. 
My herd consists of forty cows of all ages. 
To sum up, I have made in all twenty-nine experiments ac- 
cording to the new process, and all have given the desired pro- 
duct, male or female: I have had no case of non-success. All 
the experiments were made by myself, without the intervention 
of any other person. 
I can consequently declare that I regard the method of 
Prof. Thury as real and perfectly certain, hoping that he will 
soon be able to profit all breeders and agriculturists in general 
by a discovery which will regenerate the business of cattle- 
breeding. 
(Signed) G. Cornaz. 
Montet, Feb. 10, 1863. 
XI.—On the Process of Mineral Deposit in the Rhizopods and 
Sponges, as affording a Distinctive Character. By G. C. 
Wa uicu, M.D., F.L.S., &e. 
In a paper published in the Number of the ‘ Annals’ for Decem- 
ber last, Professor Max Schultze adduces evidence in support of 
the opinion that the siliceous spicules found within the chambers : 
of certain Foraminiferous shells do not constitute integral por- 
tions of these organisms, but are the products of entozootic 
sponge-growth,—the evidence im question being based on the 
strictly Foraminiferous type of the shells in which such spicules 
occur, on the presence of the latter being only occasional, on 
their position and distribution when met with, and on the cha- 
racters of sponge-sarcode as compared with “the organic sub- 
stance remaining after specimens [of Polytrema] preserved in 
spirits” have been decalcified by subjection to dilute hydro- 
chloric acid. 
But whilst this may be regarded as the circumstantial evidence 
in the case, the opinion advocated by Professor Schultze appears 
to me to be sustained by proofs of a more direct and generally 
applicable nature. These I shall now proceed to notice. 
According to Dr. Bowerbank*, “in the early stage of their 
* “On the Anatomy and Physiology of the Spongiadz,” ‘ Philosophical 
Transactions of the Royal Society ’ for 1858, p. 281 et seq. 
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