THE YOUNG SCIENTIST. 
59 
of iron, a, d, e, are put behind the work, 
directly beneath the holding plates or 
Fis. 5. 
clamps, H, F. It should be noticed that 
the heads of the bolts are outwards ; this 
is because it is difficult to get bolts of just 
the right length for a piece of work, and 
Fig. 6. 
it does not matter how far the ends of the 
bolts project behind the face-plate. 
If a piece of work requires turning on 
both radial faces, it is held off the face- 
plate by what are termed dogs, which are 
shown at d d, in Fig. 6. 
Care of Gold Fish. 
IN a recent issue of Vick's Monthly, Seth 
Green, whose reputation as a fish cul- 
turist is world-wide, gives the following 
directions for keeping gold fish : 
I will tell Miss Nettie how to care for 
her gold fish. The cause of the fungus 
growing on the fish is that the slime or 
scales of the fish had become rubbed off, 
either by handling or by some other 
means. If you wish to move your fish 
from one vessel to another, you should 
use a net made of some kind of thin, soft 
material— mosquito netting or an old veil 
will answer. They should never be taken 
in the hands. You may not have handled 
them, but some one else may have done 
so, either before or after you purchased 
them. The only cure I know of for the 
white fungus, is to make a strong brine of 
common salt and put the fish into it for a 
minute or two, then immediately put them 
back into fresh water. Do this three times 
a day. If you commence doing this when 
you first discover the fungus growing on 
them, you will sometimes cure them. 
When you have healthy fish, keep them 
well by changing the water every time 
they come to the top and keep opening 
their mouths, and seem to be breathing 
more air than water. When you change 
the water do so by taking about one-half 
out at a time and replacing it with fresh— 
a full change is very apt to prove injurious. 
Give them plenty of food, such as angle- 
worms, or any kind of insects, or fresh 
meat cut into small pieces; fish- wafer is 
also good. They should have a change of 
food every week or so. 
If you have no plants in your aquarium, 
I would advise putting in a little fresh 
earth as often as once a month, and leav- 
ing it for two or three days. There should 
be no food left in the water after it is ten 
hours old, as decaying meat taints the 
water the same as it would the air. A 
fish's nostrils are more sensitive to bad 
odors than Miss Nettie's, but she would 
