il SCIENCE.—AD VER TISEMENTS. 
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age Batteries; Electrical Measuring Instruments ; Phys- 
ical and Optical Apparatus; Pyschological Apparatus, 
etc. 
‘¢ Duty Free’’ Importations from all prominent 
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Correspondence requested. 
JAMES G. BIDDLE, 
Dealer, Manufacturer’s Agent and Importer, 
909 Drexel Building, PHILADELPHIA. 
chauston 
Horsford’s Acid Phosphate. 
Overworked men and women, the 
nervous, weak and debilitated, will find 
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Descriptive pamphlet free on application to 
Rumford Chemical Works, Providence, R. I. 
Beware of Substitutes and Imitations. 
For sale by all Drugsists. 
ANNALS 
OF THE 
INSTITUTE OF JAMAICA. 
Vol. I. No.1. September, 1897. 
LIST OF THE DECAPOD GRUSTACEA OF JAMAICA. 
By MARY J. RATHBUN, U. S. National Museum. 
TO BE OBTAINED FROM THE 
INSTITUTE OF JAMAICA, Kingston, Jamaica, 
AND FROM ITS AGENTS 
H. SOTHERAN & CO., 140 Strand, W. C., London. 
G. P. PUTNAM’S SONS, 27=29 West 23d St., New York. 
46 PP. 4T0. PRICE, ONE SHILLING. 
Dec. 1, 1896. Just Published. Sixth Edition of 
THE MICROSCOP AND MICROSCOPI- 
CAL METHODS, 
By SIMON HENRY GAGE, Professor of Microscopy, His- 
tology and Embryology in Cornell University and the 
New York State Veterinary College, Ithaca, N. Y., U.S A. 
Sixth edition, rewritten, greatly enlarged, and illustrated 
by 165 figures in the text. Price, $1.50, postpaid. 
COMSTOCK PUBLISHING CO., Ithaca, N. Y. 
Hor 12 Cents 
I will mail a finely finished original photo, 
cabinet size, of Sioux Indian Chief, SITTING 
BULL, with his Signature. Have 200 sub- 
jects, all different, of leading Western Indians. 
First-class work. Cabinet Size for 10 cents each. Some sent 
on selection. Give reference. After seeing sample you will 
want others. Indian Costume, Ornaments and Weapons. 
15,000 Flint Stone Ancient Indian Relics. 100,000 Mineral 
and Fossil Specimens. Catalogue forstamp. 13th year. 
L. W. STILWELL, Deadwood, South Dak. 
SPECIAL NOTICE. 
Position desired in Engineering Offices, with 
view to advancement. Details, upon commu= 
nication. 
C. H. D., care of Science, 
66 FIFTH AVE., NEW YORK. 
HOUGH'S “AMERICAN WOODS” 
A publication illustrated by actual specimens. 
WOODS FOR THE STEREOPTICON 
Enabling you to show upon the screen characteristic 
structures projected from nature itself. 
WOODS FOR THE MICROSCOPE 
Sections 1-1200 in. thick showing three distinct views of 
grain under each cover glass. 
WOOD SPECIMENS FOR CLASS USE 
Nothing equals these for use in the class-room. 
VIEWS OF TYPICAL TREES 
From Nature, photographs and stereopticon views. 
WOODEN CROSS-SECTION CARDS 
Perfectly adapted to printing (with type or steel plate), 
painting, India ink work, ete. 
If you are interested in wood or trees in any way send for 
our circulars and sample specimens. 
Address R. B. HOUGH, Lowville, N. Y. 
