THE YOUNG SCIENTIST. 
109 
THE 
YOUNG SCIENTIST. 
PUBLISHED MONTHLY. 
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York City . Our absurd postal laws make the charge for 
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across the continent, and delivering it to subscribers 
in San Francisco or New Orleans. "We are therefore 
X5ompelled to charge our New York subscribers 12 cents 
■extra. 
The Young Scientist has been received with so much 
favor that its circulation is already greater than that of 
any other monthly Scientific or Mechanical journal pub- 
lished in the city of New York, with the exception of the 
Popular Science Monthly. It goes into the best fam- 
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THE YOUNG SCIENTIST, 
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Our Trial Trip. 
TN offering four numbers for a trial trip 
^ for 15 cents, our object is to give to 
tbose who are interested an opportunity to 
examine the journal more fully than can be 
done by the inspection of a single number. 
Our rule is to send the four numbers at 
once, and the numbers that are sent vary 
from month to month, being always the last 
four that have been issued. 
As it is inconvenient to keep book ac- 
counts of these small transactions, those 
who remit the remainder of the yearly sub- 
scription are requested to state what num- 
bers have been previously sent. 
Articles in Preparation. 
VVTE have in preparation a large number 
* * of very fine articles upon interesting 
and important subjects. Miss Samuels, of 
Quincy Point, Mass., has promised to fur- 
nish us with a series of articles on the art 
of Modeling Busts in clay and plaster. We 
have also a very excellent series on the 
Lathe, and the best methods of using it, by 
William B. Harrison, the well-known author 
of a work on small tools. The series on 
Botany, Entomology and Photography will 
also be continued, and we are promised 
some new and very interesting articles on 
boat building. An art which is also easily 
acquired by ladies, and which will enable 
them to produce very beautiful ornaments 
on glass by very simple means, will also be 
fully described and illustrated. Our readers 
will see, therefore, that we have made ample 
provisions for furnishing them with enter- 
tainment during the coming fall and winter. 
Crystallization. 
Some very striking experiments are easily 
made with saturated solutions of certain salts. 
It is a well known fact that although under 
ordinary circumstances pure water will freeze 
when cooled to a certain point, it is possible to 
cool the water much below its freezing point 
without any formation of ice if we keep it per- 
fectly quiet during the process. Any sudden 
jar, or the smallest particle of dirt dropped into 
the water, will start the crystals forming, and 
the entire vessel will be filled with them in an 
instant. In winter this is no uncommon occur- 
rence, and it once happened that after a cold 
still night, the whole surface of a lake was sud- 
denly transformed into a sheet of ice by a slight 
disturbance near the shore, and the crystals 
shot out from a point, and could be followed 
by the eye as they made their way to the other 
side — a phenomenon witnessed on such a scale 
by very few. A super-saturated solution is in 
a condition very much the same as the water 
cooled below its freezing point, a sudden move- 
ment in the latter case sufiices to start the crys- 
tals forming. 
If we take common Glauber's salts, sulphate 
of soda, which can be bought for a few cents 
per pound, and add it to boiling water, the 
water will take up a large quantity. The salt 
should be added until the water will take up 
no more while boiling. Remove the vessel 
from the fire, allow a moment for any sus- 
pended matters to deposit, and pour the clear 
solution, still hot, into a glass vessel, an ordi- 
