no Salmon at the Antipodes. 



These must be smaller in the perforations 

 than the finest perforated zinc that I could 

 obtain, which I found would let young fish 

 go through. I first tried woven screens of 

 copper wire, but finding the deaths amongst 

 the ova to increase rapidly, I suspected that 

 something was wrong, and had tin ones 

 inserted instead. I found that I had un- 

 wittingly, by the combination of zinc and 

 copper, constructed a galvanic battery, which, 

 no doubt, was destroying the ova. I found 

 that M. Coste had on one occasion made the 

 same mistake, which he described in a paper 

 sent to the Societe Imperiale d) Acclimatation, 

 and which suggested this as the possible 

 cause of the loss which had occurred. The 

 boxes should also be divided by a screen into 

 two parts, to prevent the young fish from 

 crowding to the end where the water enters, 

 which they are eager to do. 



The boxes must be kept carefully covered, 

 so that not a crevice may be left where a bird, 

 mouse, snake, or lizard could enter, as they 

 would make short work of either ova or alevins 

 if once they gained access to them. A portion 

 of the cover should be of perforated zinc, to 



