28 
THE YOUNG SCIENTIST. 
Building (ship-building).— Cedar, pine (deal), 
fir, larch, elm, oak, locust, teak. Wet construc- 
tion, as piles, foundations, flumes, etc. — Elm, 
alder, beech, oak, plane tree, white cedar. 
House building. — Pine, oak, whitewood, chest- 
nut, ash, spruce, sycamore. 
Machinery and millwork (frames)-. — Ash, 
beech, birch, pine, elm, oak. Eollers, etc. — 
Box, lignumvitae, mahogany. Teeth of wheels. 
— Crab tree, hornbeam, locust. Foundry pat- 
terns. — Alder, pine, mahogany. 
Furniture, common. — Beech, birch, cedar, 
cherry, pine, whitewood. Best furniture. — 
Amboyna, black ebony, mahogany, cherry, 
maple, walnut, oak, rosewood, satinwood, san- 
dalwood, chestnut, cedar, tulip wood, zebra 
wood, ebony. 
Of these varieties, those that enter chiefly 
into commerce in this country are, oak, hick- 
ory, ash, elm, cedar, black walnut, maple, 
cherry, butternut, etc. 
technical journa]; it rigidly excludes those articles 
which are suited only to the wants of the profes- 
sional specialist. But as an exponent of scientific 
progress, it is undoubtedly the best (we had almost 
said the only) journal for the people at large. Those 
who do not make science the business of their 
lives, but who yet desire to keep au courant with 
the scientific thought and work of the day, can 
net afford to be without the "Popular Science 
Monthly." 
BOOK NOTICES. 
EXCHANGES. 
The Art of Hoiise-Painting : Being a Clear 
and Comprehensive Record of the Observations 
and Experiences, During Many Years, of a Prac- 
tical Worker in the Art, and Designed to Instruct 
and Assist in the Every-day Work of Painters 
and Others. By John Stevens. Price 75 cents. 
New York: John Wiley & Sons. 
This work is eminently practical, the directions 
being plain and easily followed. It is intended 
quite as much for farmers, householders and 
others as for professional painters. It touches 
upon almost every point that is likely to occur in 
every-day practice, from the selection and care of 
the brushes and material to the application of the 
paint, and must prove very generally useful. 
St. Nieliolas. It is no exaggeration to say that 
this is the handsomest and brightest paper for 
young folks now published in the English language. 
We never yet saw a family of children to which a 
copy of "St. Nicholas" did not carry unmixed 
delight. Twelve such seasons of pleasure can be 
had for $3.00, and the publishers have taken a sen- 
sible and effective way of doing good by offering to 
give, for three new subscribers, a copy to any poor, 
sick or crippled child, whose name may be sent at 
the time of sending in the subscriptions. Those 
of our young friends who have kind, warm hearts, 
can find no better way of conferring happiness. 
Address Scribner & Co., 743 Broadway, New York. 
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. 
Wanted, a small tiirning lathe, about 1^ inch 
swing, and 12-inch bed; must be well made; books 
and apparatus in exchange. R. M., care of this 
journal. 
Wanted, a copy of Holtzapfel's " Mechanical 
Manipulation." State what is wanted in exchange 
E. W., Box 4875, New York. 
Wanted, a good aquarium, medium size. State 
what is wanted in exchange. R. H., 8 Beekman 
Place, New York. 
Popular Science Monthly. The March num- 
ber of this valuable journal is at hand, and is filled 
with interesting and important matter. The 
"Popular Science Monthly" is not in any senae a 
Sign Your Name Plainly —Very few persons 
can write a signature so that it can be read. We 
involuntarily get into the habit of writing our 
names rapidly, and the result is that our corres- 
pondents cannot read them. Attempts have been 
made to obviate this difficulty by means of stamps, 
but hitherto stamps, if good for anything, have 
been clumsy, bulky, and the very reverse of porta- 
ble. The latest thing of this kind, however, is a 
pocket stamp, which can be attached to a pencil. 
It is neatly mounted in a nickel-plated case, ard 
protected by a cover, and the rubber stamp gives a 
clear, sharp impression, which can never be misin- 
terpreted. Another advantage is that they are very 
cheap. Address Scott & Co., 291 Broadway, New 
York. 
A Snbstitnte for Mucilage—Messrs. Ship- 
man & Sons, of 10 Murray street, New York, have 
just put on the market a very excellent substitute 
for mucilage. It is a thick pasty mass, of wonder- 
fully adhesive power, much more convenient to use 
than mucilage, and not liable to turn sour and 
offensive like paste. For the editor's desk it is just 
the thing, and it is excellent for scrap b,ook8 and 
similar work, as it does not render the scrap* 
transparent. 
