6 
THE YOUNG SCIENTIST. 
Tire that distance on the side of the box 
from the line already made, then square 
across the box again. Now mark across 
the top of the box diagonally from point 
to point of the knife marks already made. 
These lines form a square mitre, or an 
angle of 45 degrees. Square down the sides 
of the box ; now saw down until you strike 
the bottom of the box, minding to keep 
close to the lines, or the work will be but 
indifferently done. Now we have a mitre 
box that will do us a good deal of service. 
Science of Common Things— Fire and 
Water. 
rIEE and water have long been recog- 
nised antagonists, and, although 
water may be apparently made to burn, 
yet the general effect of water when 
thrown on burning bodies is to put out 
fire. This it does by cooling them below 
the point at which they burn, when, of 
course, the fire goes out. A very simple 
and interesting illustration of the reason 
WATEE BOILED IN A PAPEE BOX. 
We can make it more useful by cutting a 
square cut in it at one end. This will do 
very well where we want to cut stuff 
square on end. The box can be used for 
many other purposes as I will show you 
as we proceed." 
(To he continued.) 
— To enlarge a hole in a glass plate, use 
a fine rat-tail file with a little turpentine 
and camphor. If the hole is nearly the 
size of the file, the latter will stick and 
break the glass plate, if it be turned round 
from left to right, but not if it be turned 
from right to left. 
why water quenches fire is shown in the 
accompanying engraving, where water is 
being boiled in a paper vessel. To per- 
form the experiment, make a box out of 
stiff close-grained paper, by folding up the 
sides and ends and turning over the cor- 
ners in a manner well known to children. 
Such a box when filled with water may be 
suspended by. four threads from a hori- 
zontal rod, and if placed over a lamp, as^ 
shown in the figure, the water will soon 
boil. No fear need be entertained that 
the paper will burn ; the water prevents 
