1878. ] 
GOLD FISH Foil ACQUAT1C PLANT HOUSES. 
51 
stagnant moisture to remain about tbeir roots. 
They require an average temperature of GO 0 to 
70° in summer, and of 45° to G0° during 
winter. 
The plants are subject to attacks of the 
yellow and green aphides, which should be 
washed off carefully with tepid water. On no 
account should they be fumigated, since the 
fumes of tobacco have been found to have a 
deleterious effect upon them, as also upon most 
other “ cool-house ” orchids. They are in¬ 
creased by divisions of the tufts, which are 
naturally formed, but a young growth should 
form part of each division.—T. M. 
GOLD FISH FOR AQUATIC PLANT HOUSES. 
WRITER in the Field has noted 
“ that an aquatic house can hardly 
be said to be complete without gold¬ 
fish, which are exceedingly easy to rear and 
keep. What they need most is heat, for 
though they will live for a long while in a 
cold tank, they will not breed, but when 
placed in water at a temperature of 85° or 90°, 
their fertility is prodigious. In a house de¬ 
voted to aquatics, at one time under my 
charge, I had a very good opportunity of notic¬ 
ing their capabilities in this respect, and the 
effects of cold water in retarding their develop¬ 
ment. The tank w r as emptied during the winter 
months, and was filled again in April, and 
planted with aquatic plants. The fish were 
put into the tank at the same time, and were 
not removed till October or November, by which 
time the tank used to swarm with young fry, 
mostly of a dusky black colour—for they seemed 
to change to the golden colour at various ages. 
When the tank was emptied in November they 
were removed to a cold tank beneath the stage 
of one of the other plant houses, and some fish 
were always left here during the summer, but 
they never bred, and those that were put in black 
seldom or never changed to the golden colour. 
We kept a good-sized fish by itself in a slate tank 
in a cool cineraria-house, for eighteen months 
or two years, and it kept its dark colour all the 
