16 
THE YOUNG SCIENTIST. 
The glass surface coated in the manner described 
may now receive any design or sketch drawn 
upon it with ordinary ink or india-inlc. It is 
then covered with a film of any non-alcoholic 
varnish. 
This process maybe advantageously employed 
as a substitute for the labels commonly used on 
bottles in the laboratory and elsewhere, to draw 
or trace sketches on glass for magic-lantern pro- 
jections, etc 
EXCHANGES. 
Only those who are _yMr,y subscribers, and whose names 
are entered on our books have the privilege of inserting ex- 
changes. 
Exchanges must be on separate slips of paper or postal 
cards, if uiixed with business leltt.rs or cards they cannot 
be used. 
Exchanges must not exceed thirty words. 
Buying and selling belong to the advertising department. 
We reserve the right to omit the exchange column, whec 
we have not room for it, and the amount of space at our dis- 
posal will regulate the number of insenions given to each 
excha7ige, the preference being always given to those who 
have riot previously used our columns. 
To exchange, an $8 Challenge self-inking print- 
ing press, chase 3x5 inch, for type or offers. Ad- 
dress, by sealed envelope, Wm. 1\ Hill, 666 Bergen 
St.. Brooklyn, N. Y. 
To exchange, a $60 Wardwell (2 spool) sewing 
machine, nearly new, also a $3.50 stylographic 
pen, for coins and books, or offers. C. C. Bulkley, 
195 Sigourney St., Hartford, Conn. 
Wanted back numbers of "American Natur- 
alist" and "American Journal of Science and 
Arts " (Silliman's Journal), for beautiful speci- 
mens, named, of American ferns, mounted or 
unmounted. Box 16, Pine Plains, N. Y. 
"Wanted, to correspond with some one living 
near the ocean beach ; also some one living near 
any lead or copper mines. Ewing McLean, 
Greencastle, Ind. 
Beautiful Beryls, Garnets, Tourmalines, Eose 
Quartz, Muscovite, Granites in variety, etc., to 
exchange for coins, shells, fossils, minerals, 
books, magazines— anything. Describe offers 
fully. C. Le R. Wheeler, Wilmot Merrimack Co., 
N. H. 
To exchange for l new Vol. II, Young Scientist, 
1 new Vol. I of ditto, and Prof. Bell's Lectures on 
the Telephone. F. H. Burger, Chester, Pa. 
Wanted, specimens metallic ores; will give in 
exchange fossil shells, Vicksburg epoch. Tertiary 
period ; state kinds of ore. Philip Cruteher, 
Warren Co., Vicksburg, Miss. 
I have 2,000 foreign stamps that I would like to 
exchange for others. F. Gushing. P. O. Box 178, 
Wattsburg, Erie Co., Pa. 
An Official Printing Press, must be in good 
order, and type to make a complete printing 
outfit; state what is wanted in exchange. W. E. 
Cushman, Hartford, Ct. 
Minerals, birds eggs, shells, woods, stamps, 
nests, books, insects, etc., to exchange for coins, 
stamps, minerals, birds eggs, insects, and fossils ; 
send for my lists. Frank F. Fletcher, St. Johns- 
bury, Vermont. 
Wanted to exchange 1 copy of Instruction in 
Wood Engraving, or set of dozen prints, suitable 
for practice, for specimens of algae or minerals. 
S. E. Fuller, 25 Bond St., New York. 
Wanted, copy of book called Corner Cupboard, 
and other scientific books : state what is wanted 
in exchange. G. S. Griffin, Emporia, Kansas. 
I have some stamps which I will trade against 
other stamps, or offers ; please send list of stamps 
you have to exchange. J., 226 West 22d St., New 
York. 
Mosses from Germany, Colorado, and' Illinois, 
also plants, Phainogamous and Crytogamic, to 
exchange for other mosses, lichens, liverworth, 
or algaB, East and South. Prof. P. Fr. Shuelke, 
Box 128, Pekin, 111. 
Wanted, a household microscope, telescope, 
large lenses, well-mounted slides for the micro- 
scope, books on the microscope or entomology, 
in exchange for stuffed birds or minerals; de- 
scribe offers, and state what is wanted in ex- 
change. E. 0. Tuttle, Hampden, Mass. 
A large number of books, papers, and maga- 
zines, to exchange for type, printing material, or 
offers. J. T. Jackson, Box 48, Metuchen, N. J, 
Minerals to exchange for other minerals ; state 
what specimens you have for exchange. Samuel 
Wynne, Box 51, Phoenixville, Pa. 
AYill exchange, for printing outfit or shot gun, 
6 years Nos. of Scientific American, with Supple- 
ment of 1876, 545 foreign and U. S. stamps. Art of 
Swimming, Instruction in Shorthand, and other 
books. W. A. Smith, West Ilandolph, Vt. 
Insects and butterfiies from China; state what; 
is offered in exchange. Edward Laurent, 621 
Marshall St., Philadelphia, Pa, 
I have a four-legged and foiir-winged one- 
headed chicken, in alcohol, which I should like to 
exchange for a good breech-loading shot gun, or 
for standard scientific books. A. H., Box 500, 
Albion, Ohio. 
Good Specimens of the 17 years' locust (17 year 
cicada), in exchange for any kind of insects, 
beetles, moths, or butterfiies. Harry C. Beardslee, 
Painesville, Lake Co., Ohio. 
Wanted, scientific books, minerals, fossils, and 
Indian relics, in exchange for minerals, fos- 
sils, coins, old Continental and Federal money 
over one hundred years old (very rare), foreign 
stamps, A. W. Baily, Box 712, Atlantic City, N. J. 
Birds eggs, books, foreign stamps, a good ham- 
mock, and revolver, to exchange for birds eggs 
i and Avt)rks on birds. F. D. Brown, Gallupville, 
I Schoharie Co., N. Y. 
I A magic lantern with eight slides, cost $5, and 
I other things, to exchange for scientific books, 
chemicals, or chemical apparatus, etc. A Camp- 
bell, Box 31, Derrick City, McKean Co.. Pa. 
Idaho Mineral Specimens, for bound books on 
science, travels, history, biography, political, ma- 
sonic, and others that are instructive. J. P. 
Clough, Junction. Lemhi Co., Idaho. 
I have minerals (including fossils and den- 
trites), to exchange for minerals; also a papyro- 
graph outfit, without press (worth $25), for offers. 
W. H. Eastman. Hyde Park, Mass. 
Klose's celebrated " School for the Clarionet," 
new, $3; will exchange for telescope, microscope, 
piccolo, books, or offers. Rush Holbrook, Wone- 
woe, Juneau Co., Wis. 
One or two handsomely mounted red deer heads, 
attractive ornaments for any dining-room or hall, 
for microscope, telescope, sporting implements, 
camping outfit, scientific books, or offers. R. B. 
Hough, Lowville, Lewis Co., N. Y, 
Lower Silurian fossils from near the Falls of 
St. Anthonv.5Minn.. for good microscopic material, 
etc. John Walker, 810 Ave. S., Minneapolis. Minn. 
