80 
THE YOUNG SCIENTIST. 
EXCHANGES. 
Yearly subscribers to the Young Scientist have 
the privilege of inserting three exchanges (or one 
exchange three times) during the year. This 
privilege is strictly confined to exchanges; buying 
and selling must be carried on in the advertising 
columns, where the charge is 30 cents per line. 
Each exchange is limited to thirty words, making 
about four lines, and in order to receive attention 
must be written on a slip of paper by itself. We 
file all letters received, and have no time for copy- 
ing out exchanges and queries. 
As we desire to make the journal of the utmost 
value to all, and not merely to serve the interests 
of individuals, we shall strictly adhere to these 
rules, which are certainly liberal, giving as they 
do advertising to the value of $3.6U free to each 
"subscriber. 
Wanted, a collection of Southern woods, for a 
collection of New Hampshire woods; will ex- 
change for rough pieces. W. P. Adams, Pitts- 
fleld, N. H. 
For exchange, a guitar, patent head, nearly 
new, cost with strings $14— splendid instrument, 
in good order ; state what you have to exchange. 
W. Z. Allen, Monrovia. Ind. 
A No. 1 self-inking Official press, costing $10, 
and $13 worth of type and fixtures, to exchange 
for a combined bracket saw and lathe, or offers. 
C. A. Bacon, Elba, Lapeer County, Mich. 
To exchange, Bourne's " Treatise on the Steam 
Engine," cost $5, for chemical apparatus and 
chemicals of the same value. E. T. Birdsall, 39 
East •2'2d street. New York. 
Wanted, 350 or 400 different kinds of foreign 
stamps : state wliat is wanted in exchange. John 
S. Briggs, Newark, N. Y. 
Wanted, January and March (1878) Nos. of 
Young Scientist in exchange for the "Mineral- 
ogist Companion." Walter Brockstedt. 2118 Car- 
ondelet Avenue, St. Louis, Mo. 
Printing press, cost $35, and several fonts of 
type, in exchange for anything pertaining to sci- 
ence, literature or art. E. S. Dayton, Basking 
Eidge, N. J. 
To exchange, one telegraphic key and sounder, 
in good shape ; also a new scroll saw ; state offers, 
John Duff, Jr., Pontiac, 111. 
Two Bunsen batteries to exchange for engrav- 
er's tools, or Vols. 1 and 2 of Scott's " Coin Jour- 
nal," or old U. S. coins. Clark Horn, Jr., Box 582, 
Scranton, Pa. 
An oscillating steam engine, 1-inch bore, 2-inch 
stroke, for a Queen's Household microscope, or 
offers. L. Kent, Santa Anna, Los Angeles Co.. 
Cal. 
Wanted, in exchange for valuable books (of 
which lists will be sent on application), Packard's 
" Guide to the Studv of Lisects," edition of 1876. 
C. H. L., 57 North 1st street, Edgefield, Tenn. 
To exchange, cocoons of Attacus Luna, Cecro- 
pia and Polyphemus, for specimens of entomol- 
ogy or geology. Geo. A. Lippincott, Box 50, Wat- 
sontown, Northumberland Co., Pa. 
A new stationary steam engine of ^2 -horse 
power, worth $30, in exchange for a good watch, 
or almost anything ; mention offers. H. Macken- 
zie, Jr., Petroila, Ontario, Canada. 
To exchange, complete set drawing instru- 
ments, cost $3 : state offers. J. Mueller, 2453 Kos- 
ciusko street, St. Louis, Mo. 
In exchange for books, a Novelty printing press 
in excellent condition,' prints a form 6>2XioM ins. ; 
cost $32, ink roller cost 75c., and $1.50 worth blue 
ink. J. A. Osborn, Scientist, Mahmal, Cambridge- 
port, Mass. 
To exchange, a Novelty printing press, type 
and accessories, for a microscope with acces- 
sories, or minerals, or offers. T. W. Patterson, 
Warsaw, N. Y. 
Will exchange one or more of my new exten- 
sion step fruit ladders, the " Climax," price $2 50 
for merchandise. H. E. Phelps, Marshall, Mich. 
Wanted, an achromatic photo camera, a good 
shotgun, or scientific books or apparatus, in ex- 
change for a fine scroll saw in good condition 
A. B. Porter, 501 N. Tenn St., Indianapolis, Ind. 
"The History of Our Country," by Benson J. 
Lossing, cost $15 ; also other books to exchange 
for scientific and practical books and apparatus. 
H. M. Kauschkolb, 246 Delord St., New Orleans, La. 
Telegraphic key and sounder, finely wrought 
on proper base, cost $8 ; will exchange for good 
revolver. S. G. Keese, Box 133, Elizabethtown, 
Lane. Co., Pa. 
To exchange, one set of Lily carving tools of 
three pieces ; state what is offered in exchange. 
: B. M. liockwood. Franklin, Mass. 
Wanted, a first-class work on entomology, with 
colored plates, for Stanley's Travels, calf bound, 
nearly new ; also other books and minerals to ex- 
change. H. Salisbury. Box 399, Whitewater, Wis. 
Wanted, a coachmaker's vice, opening 8 or 9 in., 
in good order, or a lot of thumb screws, in ex- 
change for an E-flat cornet worth $15, or violin 
worth $12. B. H. Smith, New York Mills, Oneida 
County, N. Y. 
Wanted, a Seltz's boys' theatre ; state what is 
wanted in exchange, and give full particulars of 
the style of theatre. H. C. Spaulding, 7 Princeton 
street, Boston, Mass, 
Kane's Arctic Explorations, for a small print- 
ing press with type and ink. H. B. Taylor, 
Tehuacana, Limestone Co., Texas. 
A game of parlor billiards, cost $4, will be given 
in exchange for something of equal value. J. H. 
White, Canajoharie, N. Y. 
Back numbers of "Youth's Companion," for 
the years 1877 and 1878, in good condition, to ex- 
change for chemicals, chemical apparatus, or of- 
fers. F. Willis, 3 Myrtle street, Boston, Mass. 
THE 
YOUNG SCIENTIST. 
Published Monti dij at 50 cents iper year. 
Postage free to all parts of the United States 
and Canada, except New York City, where the 
law requires 12 cents extra postage, making the 
subscription in New York City 62 cents. 
Postage stamps taken at full value, but only for 
amounts less than $1.00. One and Two-cent 
stamps preferred. t 
TO ABVEBTISERS. 
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 published in the city of 
New York. It goes into the best families, and 
has their confidence. No clap-tbap adveetise- ; 
MENTS, OR ADVERTISEMENTS OF PATENT MEDI- 
CINES received AT ANY PRICE. 
Advertising Bates— 30 cents per line, agate 
measure. 
All Communications should be addressed to 
THE YOUNG SCIENTIST, 
P. 0. Box 2852. 176 Broadway, New York. 
4^For Club Bates, Premiums, etc., see Pros- 
pectus. 
