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THE YOUNG SCIENTIST. 
THE 
YOUNG SCIENTIST. 
PUBLISHED MONTHLY. 
Terms — Fifty Cents per year. 4®=- Postage free to 
all pai-ts of the United States and Canada, except New 
York City . Our absurd postal laws make the charge for 
delivering our journal to subscribers in New York city 
five times as great as that required for transporting it 
across the continent, and delivering it to subscribers 
in San Francisco or New Orleans. We are therefore 
compelled to charge our New York subscribers 12 cents 
extra. 
10 Mr^l£2IS^SS, 
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- 
ilies, and has their confidence. No olap-tkap advee- 
TISEMENTS, OR ADVERTISEMENTS OF PATENT MEDICINES 
RECEIVED AT ANY PRICE. 
Advertising Rates— 30 cents per line, nonpariel 
measure. 
All Communications should be addressed to 
THE YOUNG SCIENTIST, 
P. O. Box 4875. 176 Broadway, New York. 
4®- For Club Rates, etc., see Prospectus. 
Our Trial Trip. 
TN offering four numbers as a trial trip 
J- for 15 cents, our object is to give to 
those 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. 
those who are likely to take a journal like 
ours are in a comparative minority. Thus 
far, however, our success has been quite 
encouraging, and now, in order to increase 
this success still further, we have deter- 
mined to enlist the efforts of every one of 
our present subscribers by the following 
liberal offer, which, be it remembered, ap- 
plies only to those whose names are now on 
our books. 
Any subscriber sending us two new 
names, with the money — $1.00 — will re- 
ceive his own copy for 1879 free. That is 
to say, we will, to our present subscribers, 
give three copies for one dollar. 
lu doing this we have two objects in view. 
In the first place we are anxious to extend 
our circulation as much as possible, and in 
the second we desire to acknowledge our 
sense of the good feeling which has prompt- 
ed so many to support a new, and to them 
untried enterprise. 
During the coming months we expect to 
make the Young Scientist more than ever 
worthy of the support of its readers. Our 
draughtsmen and engravers have their 
hands full of good things in store for the 
journal, and as we intend to enlarge the 
journal permanently next year, adding four 
more pages, we feel confident that during 
1879 both our readers and ourselves will 
have " a good time." 
A Liberal Offer. 
EVERY one knows that the greatest ob- 
stacle in the way of extending the cir- 
culation of a new journal, provided it has 
any merit, is the difficulty of bringing it 
before those who are likely to subscribe. 
In proportion to the results obtained, mis- 
cellaneous advertising is too expensive, for 
Hints on Filing. 
Carrying the Me.— The most natural move- 
ment of the hands and arms in fihng, is to 
carry the file in circular lines, the several 
joints of the limbs being the centres of motion; 
this movement of a convex file would appar- 
ently give a concavity to the work. The real 
tendency, however, especially on narrow work, 
is the reverse, (owing to the work acting as a 
fulcram, over which the file moves with more 
or less of a rocking motion,) giving an actual 
convexity to its surface, except when in the 
hands of a skilful operator. The real aim, 
therefore, should be to cause the file to depart 
