100 
THE YOUNG {SCIENTIST. 
favorable for such ezperiments, the operation of 
warming and rubbing will only Lave to be repeated 
once or twice to charge the jar sufiflciently. I hope 
that W. will find this method successful. 
W. N. M. 
31. In answer to J. F. M., to make skeleton 
leaves, I give him the following recipe, which he 
can try. The leaves are to be soaked' in water for 
some time; the solid part will then gradually rot 
out, and leave only the flbr s. These will be of a 
brown color, and must be bleached by means of a 
weak solution of chloride of lime ^bleaching pow- 
der). The leaves must afterwards be carefully 
washed, so as to free tliem from the chloride of 
lime, otherwise they will speedily rot. They 
should then be dipped into a little gum water, and 
dried. J. H. 
EXCHANGES. 
In this column yearly subscribers who may wish 
to exchange tools, apparatus, books, or the pro- 
ducts of their skill, can state what they have to 
offer and what they want, without charge. Buying 
and selling must, of course, be carried on in the 
advertising columns. 
Graham's Handbook, Synopsis, and 1st and 2d 
Readers Standard Piiouography; tools or advanced 
scientific books preferred in exchange. E. H. Bid- 
well, Vineland, N. J. 
Complete outfit for stamping key checks, worth 
$10, in exchange for practical receipt books, or 
bracket saw with lathe and drill attachment. John 
Whitty, Jr., Polloksville, N. C. 
Woodward's Hospital Microscope wanted in ex- 
change for chemical scales and weights; difference 
in cash. J. Siler, 1,212 Broadway, St. Louis, Mo, 
For exchange, an entire printing outfit, cost $50; 
state what you have to exchange. F. R. Miller, 
760 East Fourth street, South Boston, Mass. 
Good $50 job printing press, in perfect order, for 
a scroll and circular saw, or scroll saw alone; saw 
must be in good order. Samuel J. Jones, Box 137, 
Oxford, N. C. 
Wanted, foot power scroll saw, lathe, or both 
combined, or good microscope, for minerals, books 
on plant culture. Art Journal in parts, or cancelled 
postage and revenue stamps, D. S, Kimball, 48 
Exchange Place, New York. 
Wanted, small steam engine and boiler of from 
1 to 2 horse-power; state what is wanted in ex- 
change. Address Jno. McElvery, Flatbush, L. I. 
Wanted, telegraphic and mathematical instru- 
ments; Pitman's Phonography in exchange; also 
thorough instruction in same by mail. F. S. P., 
King's River, Fresno County, Cal. 
A set of chemicals and apparatus; also a set of 
wood engraver's tools, glass and instruction book, 
to exchange for a scroll saw and a microscope. The 
chemicals and tools cost nearly $40; will give a good 
trade. F. H. Jackson, Angelica, N. Y. 
Wanted, a copy of Holtzapfel's "Mechanical 
Manipulation." State what is wanted in exchange. 
E. W., Box 4875, New York. 
Wanted, a small turning lathe in exchange for a 
pair of telephones. J. C, care Young Scientist. 
Scroll saw wanted in exchange for handsome 
portfolio of six water color sketches. Address 
F. S., care Box 4875, New York. 
Specimens of the marbles, granites and minerals 
of Vermont, in exchange for Western mmerals, or 
good fossils; minerals and fossil woods from the far 
West specially desired. Dr. H. A. Cutting, State 
Geologist, Lunenburgh, Essex County, Vt. 
Wanted, complete Lester combination scroll saw 
in good condition; books in exchange. J.T.Jack- 
son, Box 48, Metuchen, N. J. 
Gold watch (cost $150) in exchange for a good 
microscope. E. W., Box 4875, New York. 
Wanted, microscope, or scientific and mechanical 
books and apparatus, in exchange for printing 
press, cost $21, with or without type and material. 
J. P. Burbank, Salem, Mass. 
Cigar machine to exchange for bracket saw or 
good microscope. Leonard Alexander, Linneus, Me. 
Wanted, microscope ; new Tillotson relay and 
part cash given in exchange. W. 0. F., 83 Down- 
ing street, Brooklyn. 
To exchange, a Kidder electric battery, for a pri- 
vate line telegraph instrument. Charles L. Feld- 
kamp, 200 W. Randolph street, Chicago, Ills. 
First-class scroll saw, double treadle, all improve- 
ments, worth $40, for second-hand ToUes' objec- 
tive, not higher than 1-5. John D. White, Chieo- 
pee, Mass. 
Camera for taking portraits wanted; state what 
is wanted in exchange. J. F. H., care of this jour- 
nal. 
Magic lantern, nine slides (two mechanical) in 
complete order, in exchange for good compound 
microscope. T. R. Barwood, Flatbush, L. I. 
A work on painting and wood finishing, value 
$1.50, to exchange for scroll saw patterns. R. F. 
Hanscam, North Barnstead, N. H. 
A good telegraph instrument, cost $7 50, for a 
couple of good books on chemistry, electricity, etc. 
H. B. Kinney, Hamlin, Brown County, Kansas. 
Wanted in exchange for a second-hand scroll 
saw, treadle power and wooden Irame, a good Ex- 
celsior microscope, or live box. Jos. G. Thorp, 54 
West Seventeenth street. New York. 
The Phonograph—Our readers who reside in 
or near New York, can now have an opportunity 
not only of seeing and hearing this marvellous in- 
vention, but of listening to a very lucid explana- 
tory lecture, which, by the aid of a series of strik- 
ing and beautiful experiments, is rendered easy of 
comprehension, even by children. The exhibition 
is given every evening at Irving Hall, corner Irving 
Place and Fifteenth street, and in addition to the 
Phonograph, and Speaking and Singing Tele- 
phones, there are the attractions of exquisite music 
by Geo. Morgan, Madame Cole, Levy the cornet 
player, and others. The effect produced by the 
cornet playing of Levy, and the singing of Madame 
Cole and Mr. Rose, as reproduced by the phono- 
graph, is marvellous. Amongst other feats, Levy 
played "God Save the Qaeen " into the phono- 
graph in four octaves, and the instrument accur- 
ately reproduced his notes ! 
Those who wish to enjoy a very delightful enter- 
tainment, and to obtain a clear idea of the princi- 
ples of the phonograph and telephone, cannot do 
better than visit Irving Hall. 
