242 
on what does such difference depend? (3.) Are all the eggsin _ 
any one fish of the same size? and (4.) What is a Par? The . 
apparatus employed consisted of a paraffin cask having a tap 
near its lower end, a supply tank made of deal, and two 
hatching-trays, all the foregoing being charred inside and . 
painted externally with Brunswick Black; these, with an extra 
tub to contain a further supply of water, a bucket and a leech- 
glass as an egg-picker, constituted the whole of the articles 
used, which were raised to their proper positions on old empty 
boxes in an unused coach-house. On November 28th he 
received from Howietoun 500 eggs of the Loch Leven trout, 
which had been spawned on the previous day; these were sent 
by rail, and, on arrival, the end of the cigar-box in which they 
were contained was found to have been broken in, and a 
portion of the cover cracked, owing to the rough usage which 
it had met with in transit. The eggs were in layers on muslin, 
packed in damp moss; and as it has been asserted that injury 
to the eggs during the first few days after they have been 
taken, is likely to cause malformation or monstrosities in the 
young, it is worthy of remark that in only one instance was 
such effect perceived, and in that one the young fish had two 
heads, but still lives. On February 17th, being the 82nd day, ~ 
eleven hatched in the trays, and one on the 20th, while on 
visiting the trays upon the following morning the young were 
all found dead and the waters smelt strongly of paraffin; so all 
was at once thrown out, and fresh used; the cask which was 
suspected of being the cause, was rejected. On the 22nd some 
hundreds of young fish presented themselves, and they con- 
tinued hatching until the 29th. As so many have described the 
appearance of the young fish when just hatched, a detailed 
account was not gone into, but a coloured diagram was exhi- 
bited, giving in a highly magnified form the appearance of the 
salmon on the day of hatching. The young fish mostly come 
into the world head first, the egg splitting down the back, but 
in one instance the young was choked before it could make its 
exit. Another young fish emerging tail first, had its head 
caught in the shell, and there for five days was held a prisoner, 
