






THE FRESH-WATER AQUARIUM. - 207 
ment of the fish, as would give some idea of the practical 
parts of the art of pisciculture. There are many details con- 
nected with the subject which we have not touched upon. 
They can be found very thoroughly treated of in any of the 
modern works on pisciculture, of which Norris’ “American 
Fish Culture” is the latest and most practical. 
In the above all general considerations have been avoided. 
It would, perhaps, have been as well to have stated that the 
arguments in favor of artificial hatching of eggs is based on 
the small proportion of them that are hatched when deposi- 
ted in a stream, by the fish following the course of nature, 
and the very large proportion when hatched by artificial 
arrangement. The many enemies of fish spawn (other fish, 
water insects, birds, rats, not to speak of sediment, fresh- 
ets, ice, etc., etc.) reduce the number of the eggs sadly. It 
been calculated by English pisciculturalists that nót one 
salmon reaches the proper size for the table out of every 
t ousand eges deposited in the stream. As the salmon 
migrates to the sea when weighing only a few ounces, it 
e 
would, however, be more subject to casualty than the trout. 

THE FRESH-WATER AQUARIUM. 
BY C. B. BRIGHAM. 

(Continued from page 136.) 
We have seen that the aquarium is to be distinguished 
from the common fish-globe by its self-supporting character. 
We have examined in a general way the philosophy of the 
"quatium and concluded that the rectangular tank was the 
most useful one to have. Let us now look for a situation 
tor the tank before the specimens are placed within it R 
I5 desirable that the sun should shine upon the tank for at 
. 7 an hour during the day ; an eastern or southern aspect 
