84 Correspondence of J. Nickles. 
In one of his letters to Galileo, Luc Valerio considers the rays 
proceding from the central part of the solar disk as the mor 
active. i 
Analogous facts have been observed by Mr. Roscoe, according” 
to whom the center of the disk exerts a more intense cheaslaall 
action than the borders. He has also observed that the south 
polar zone is more active than the north. ip 
Acclimation of Salmon in Australia.—Recent experiments cat 
ried forward by the Acclimation Society have shown that it is 
possible to transport to distant countries the eggs of fertile fishes. 
One of its members, Mr. Millet, having observed that melting 
ice diminished the pulsations of the young fish of the Salmon 
idee and delayed the hatching of the eggs, took the idea that this” 
2 
on the 23d. Everything indicates success. ag 
Similar attempts have been made in the French possessions 12 
Kggs of 
attention of physiologists, has been thoroughly studied by Mr. 
ury, according to whom the product is always of the male 
sex when the fertilization of the ova occurs at complete matul 
ch is always female when it takes place at a less advanceé 
riod. 
a 
_ There is a very simple way of solving this problem. It is 0 
select for experiment species that come to maturity in successiOM 
