16 THE YOUNG 
The book is evidently intended for beginners, but 
does not always give them needed caution. The exper- 
iment under section 43, page 28, might be a dangerous 
one. It would have been well had the author been 
more explicit. 
We welcome the book as a step in the right direction, 
but trust that the author will take an early opportunity 
to improve it. 
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 car- 
ried 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 aU 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 aU and not merely to serve the interests of individu- 
als, we shall strictly adhere to these rules, which are 
certainly liberal, giving as they do advertising to the 
value of $3.60 free to each subscriber. 
Groffs Model Suburban Architecture wanted in ex- 
change for NicoU's Railway Building, Templeton's 
Practical Examination of Steam and Steam Engine, and 
Colburn's Locomotive Engine. AU entirely new. F. H. 
Jackson, Angelica, N. Y. 
Wanted, a small turning lathe, state what is wanted 
in exchange. Ralph A. Pillsbury, P. O. box 555, Bel- 
fast, Me. 
To exchange, beautiful rose, milk, greasy and smoky 
quartz, graphic granite, orthoclase, etc., for aboriginal 
relics, coins, or other minerals. Prof. C. L. R. Wheeler, 
Bedford, N.Y. 
A collection of invertebrate fossils, accurately labeled 
and worth $225, to exchange for good microscope. The 
instrument must be of modern make, and in first-class 
condition. S. Calvin, Iowa City, Iowa. 
A collection of foreign and dept. stamps, or a large 
collection of bird eggs of the Southern States, for a set 
of drawing instruments or books on plain and ornamen- 
tal penmanship. Address Q. R. S., Mt. Pleasant, Wash- 
ington, D. C. 
Wanted almost anything in exchange for a complete 
set of cabinet maker's tools. The chest alone is worth 
twenty-five dollars. Address Mr. Clark, P. O. box 37, 
Brooklyn, N. Y. 
For exchange, two good dial telegraph instruments, 
and two good Morse telegraph instruments, for printing 
press or bracket saw. James Scott, 20 Patchen ave, 
Brooklyn. 
A card printer, type and cards worth $1.50, and the 
book "His own Master" will exchange separately or 
all together, books, or offers. Geo. R. Simpson, Janes- 
ville,lowa. 
A stationary cylinder steam engine, or hardware 
goods in exchange for an electric call bell. L. J. Otis, 
973 Prairie Ave., Chicago, 111. 
Wanted for a good Giindlach No. 4 Objective, a 
or 2 inch Objective of wide angle. C. Onderdonk. 
Brooksburg box, Madison, Ind. 
A spy glass costing five dollars, to exchange for a 
companion scroll saw and turning lathe in good condi- 
tion. John Buck, Brazil, Clay Co. Ind. 
Forty good photo-lantern slides, plain and colored, 
for a good printing press and outfit ; or a small screw 
cutting lathe ; or first class microscopic objectives, or 
offers. Wm. R. Brooks, Phelps, N. Y. 
Wanted, a small rifle, in good order, bore 22-100, for a 
telegraphic key and sounder, instruments are made of 
brass finely wrought, mounted on a japaned iron base. 
Louis E. P. Smith, 6 Alpine st, Boston, Mass. 
SCIENTIST. 
Ferns, mounted or unmounted, for Northern species, 
of same. List of those on hand and those wanted sent 
on application, Maj. R. H. Wildberger, Ky. Mil. 
Inst., Farmdale, Kj'. 
Two good business lots, central, in Ellsworth, Kan, 
for good microscope, accessories and books, chemical 
balance, or gold watch. Wm. Zimmerman, 114 Dear- 
born St, Chicago, 111. 
To exchange, a collection of 500 rare stamps, with 
book which cost $1.50. The whole worth about $7.00. 
State offers. Albert N. Webster, 106 South Park ave, 
Chicago, 111. 
Hinkley knitting machine, worth $40, for a watch 
or breach loading shot gun, Harry Holden, Black Earth,, 
Dane Co. Wisconsin. 
One dozen (assorted) mounted objects for microscope,, 
cost $2.50 (By J. W. Queen & Co.) for useful books on 
any subjects, or old U. S. coins. W. M. Stribliug, P. O. 
box 350, Circleville, Pickaway Co, Ohio. 
Cabinet mineral specimens, for Masonic publications,, 
or other instructive books. Light reading not wanted. 
J. P. Clough, Junction P. O., Lemhi Co. Iflaho. 
Swiss watch lathe, brass, steel shaft and box, cost 
$25. Also a ^ear cutting lathe nearly complete. Ex- 
change for minerals, microscopic slides and books. H. 
A. Cutting, Lunenburg, Vt. 
Twelve dollars worth of parlor tricks, very beet 
make, in exchange for a good microscope or a scroll 
saw with lathe attachment, of equal value. Prof. C. H. 
Houghton, Middleboro, Mass. 
Book on magic, cost $2,50, for back numbers Young 
Scientist, and foreign stamps. Omega, Post Warrene- 
burg. Mo. 
Wanted, Parrishes Pharmacy and chemicals. State 
what is wanted in exchange. . C. O. K., 1520 Fairmount 
Ave, Phila. 
Stereoscopic views of New York city and vicinity, in 
exchange for fossils from the Western states and terri- 
tories. T. P. Wendover, P. O. box 1862, N. Y. city. 
Chemical apparatus or balance, spy glass or saw 
wanted, in exchange for novelty printing press, with 
sixty fonts of type, Alex, 151 East 33d st, N. Y. 
Microscope worth $7.00, and cabinet with forty good 
slides ; for better instruction or other educational ap- 
paratus. Particulars on application. Arthur Hobart, 
Penn Yan, N. Y. 
Wanted a copy of Bourne's Treatise on the Steam 
Engine, lor a full set (7 vols, bound) of Technologist, 
cost $19.25. W. J. Allen, 256 Twentj'-second st, Bkyn. 
Wanted, a three wheel " velocipede " large size, state 
what is wanted in exchange. Peter J. Murray, box 743 
Wilkesbarre, Pa. 
To exchange, one Bunsen and two Smee batteries ; for 
books on electro-metallurgy or quantative or qualitative 
analysis, A. W. Palmer, care of Watch Co. Spring- 
field, 111. 
A pistol in good order, cost $3.00, in exchange for an 
electric bell. A. W. Honywill, 217 Cabot st, Boston, 
Mass. 
Collection of over 500 rare stamps, including Ecuador 
Cape of Good Hope, Barbadoes, Honduras, etc.. in ex- 
change for microscope, minerals, or scientific publica- 
tions. Jas. G. Kitchell, 345 Race st, Cincinnati. 
Music box, printing press, cost $35, and complete out- 
fit for cutting stencil plate for marking clothing, cost 
$25, for boiler large enough for }i horse power. Geo. 
A. Battles, Westminster, Mass. 
Three-quarter portrait camera tube, with box and 
tablets all new ; for books on science, medicine, his- 
tory, or travel, or microscopic slides, J. S. Mason, Me- 
dina, Ohio. 
Wanted, a printing press or set of draughting instru- 
ments for a C cornet (worth $30.00) or Queen's Univer- 
sal Household Microscope and accessories. G- . ..E. T., 
Box 475, Westboro, Mass. 
