88 THE YOUNG 
the nerve-centres, by suddenly plunging the 
whole surface of the skin, with its terminal 
nervous twigs, into a cold bath. For a time, at 
least, the central activity must be reduced in 
force, if not in form. When, therefore, a man 
plunges, and immediately after strikes out to 
swim, it is not only possible, but probable, that 
he may become exhausted, and fail from de- 
pression of energy, with cramp. It is important 
that this should be noticed. We do not think 
sufficient attention has yet been given to this 
cause of ' accident ' in bathing. Cases of ex- 
haustion from remaining too long in the water 
with a full stomach are understood. That to 
which we have adverted is not recognised." 
EXCHANGES. 
Wanted, " Butler's Family Aquarium ; " will give 
in exchange two books, entitled " Laughing Gas " 
and " De Walden's Ball-room Companion." E. 
R, Brown, Box 25, Covington, Ind. 
A small printing press and outfit, cost $12, for 
steam engine, Demas lathe and scroll saw, or 
offers. Ernest Coithell, Eockport, Maine. 
A patent speetograph, cost when new $1.25 ; rare 
minerals, birds' eggs, and postage stamps, to ex- 
change for minerals, foreign coins, Indian relics, 
or offers. Frank F. Fletcher, St. Johnsbury, Ver- 
mont. 
Eggs, of the English sparrow, for good speci- 
mens of other birds' eggs ; botanical specimens 
mounted and unmounted to exchange ; lists ex- 
changed. C. R. Hexamer, New Castle, Westchester 
Co., N. Y. 
Two telegraph instruments, nearly >2 mile of 
wire, one battery ; also i in. magnet. 8 Scientific 
American Supplements, full of information ; new 
history of United States; a $4 German silver- 
trimmed flute ; what offers ? Ewing McLean. 
Greencastle, Ind. 
Wanted, The Workshop Companion : I have 
Gaskell's Compendium, $1; The Round-of- 
Months, 75c. ; Amateur's Hand Book, I5c. ; also 
books, papers, pictures, etc. ; send lists of what 
you have to exchange. W. B. Moore, Morgan 
Station, Ky. 
McAllister's magic lantern and 30 pictures (cost 
over $95), to exchange for job type and ma- 
terial, or a good microscope and specimens ; $20 
worth of novels for a good $15 or $20 household 
microscope; rare mineral and Indian relics for 
exchange or sale ; refers to editor. John T. 
Patrick, Wadesboro, N. C. 
What is offered for one of the Climax extension 
step ladders? H. E. Phelps, Manhall, Michigan. 
Wanted, a good microscope in exchange for a 
scroll saw: instrument must be in good order, 
and magnifying power of from 200 to 300, or 400 
diameters. H. E. Rhodes, Brighton, Iowa. 
To exchange, a $3 microscope for some old 
issues of Canada postage stamps. Wallace Ross, 
Lock Box 97, Rutland, Vt. 
Wanted, a printing press ; have for exchange a 
good microscope (Smith & Beck, London ), 3 object 
glasses, and three eye i)ieces. power from 15 to 
600 diameters, original cost $60 ; books, chemicals, 
guitars, and other things for exchange. E. F. 
Underwood, 9 Murray St., N. Y. 
Wanted to exchange, Colorado minerals, such 
as jasper, smoky quartz, silicifled wood, etc., for 
good specimen fossils, or perfect crystals of min- 
erals of other localities. H. F. Wegener. Denver, 
Colorado, 
SCIENTIST. 
One Natural Philosophy, one Bryant & Strat- 
ton's Counting-house Book, and two long bows, 
with arrows, to exchange for cabinet specimens or 
curiosities. W. D. Wright, Look Box 17, Bremen, 
Indiana. 
Wanted, coins, minerals, and type ; send lists 
of what you have and what is wanted in exchange. 
A. Campbell, Derrick City, McKean Co., Pa. 
An Excelsior Printing Press, with equipments, 
compai-atively new. cost over $47, for double barrel 
breech-loading shot gun, with reloading tools and 
shells. William A. Hervey, Box 134, Taunton. 
Mass. 
To exchange, 400 stamps, all different, in a stamp 
album, for a small printing press with type, etc. 
Arthur D. McGerald, 106 Bird Ave., Buffalo, New 
York. 
Revolver, microscope, microphone, 4 magnets, 
skates, skate sharpener, copying pad, books, 
magazines, $7 worth of rosettes, and lots of other 
things to exchange ; I will give you a better trade 
than anyone else can. Chas. T. Conover, Esper- 
ance, Scho. Co., N. Y. 
To exchange, $5 pair of telephones for mounted 
microscopic specimens, good objective, lathe 
chuck, watch, type and cases, or offers ; describe 
offers. Wm. R. Brooks, Phelps, N. Y. 
What offers for Roger Scroll Saw, 55 large pat- 
terns. J. Brower. 3,150 Frank ford Road, Phila- 
delphia, Pa. 
Photographs of ten of the most influential In- 
dians of Spotted Tail Agency, including Spotted 
Tail and family and four oil chromes, very beau- 
tiful, for printing press, scroll saw, or offers. 
Luther Emerson, Creighton, Knox Co., Neb. 
"Appleton's Picturesque America," neverbeen 
read or handled, value $24; "Dana's Miner- 
alogy," $10, and coins, to exchange for a breech- 
loading shot gun, Winchester or Evan's rifle, or 
offers. D. M. Fuller, Box 115, Camden, Maine. 
Scroll sawing outfit, $6 ; microscope, $3 : pocket 
telescope, $1 ; Gaskel's Compendium, $1 ; Williams' 
Complete Painters' Guide, $2. What offers for all 
or part ; printing outfit preferred. F. W. McNair, 
Box 46, Fennimore, Wis. 
$7 worth of books or papers, to exchange for a 
Household microscope or offers. Jonas D. Rice,. 
221 Academy St., Mercer Co., N. J. 
One pair best steel climbing irons, handsome 
seven shot, 22 calibre revolver, full nickel plate, 
ten dollars worth of boys' papers, and magazines, 
for works on natural sciences or offers. W. M. 
Stribling, Circle ville. Pickaway Co., Ohio. 
Idaho cabinet minerals, books, revolver, stencil 
outfit, an electrizer, for well-bound books of 
travel, biography, history, science, masonry and 
others of an instructive nature. J. P. Clough, 
Junction P. O., Lemhi Co.. Idaho, 
Dumb bells of all sizes, to exchange for most 
any thing ; send for circular containing weights 
of them to J. P. Donohue, Box 7, Davenport, Iowa. 
Wanted, scientific books and papers, micro- 
scope, drawing instruments, telephone, stamps- 
and coins, in exchange for scroll s^w, type, cards, 
revolver, shot gun, magazines, scientific books, 
or almost anything. W. L. Goodsell, Bath. N. Y. 
A pair of New York Club skates, worth $3.50. 
also coins, minerals and postage stamps, for 
books or offers ; correspondence invited. E. F, 
Greene, P. O. Box 889, Bath, Steuben Co.. N. Y, 
A nice marine oil painting, ready framed, worth 
$5.00 : state what is offered in exchange. C. Ham- 
mond, Artist. P. O. Box 47, Chatham, Barnstable 
Co., Mass. 
Photographic camera, one portrait and one land- 
scape tube, with chemicals complete, in exchange 
for medical books. J. Frederick Herbert. 1.324 
Poplar St., Philadelphia, Penn. 
Trump's and Russel's scroll patterns, worth 
$10; for large lenses preferred. H. J. Peters^ 
Rogersville. Ohio. 
