•LABORATORY APPARATUS 
AND REAGENTS 
SELECTED FOR LABORATORIES OF 
CHEMISTRY AND BIOLOGY 
IN THEIR APPLICATION TO 
EDUCATION, THE INDUSTRIES, MEDICINE AND 
THE PUBLIC HEALTH 
The above is the title of our complete 656 page catalogue, containing 12,- 
356 items with 3,295 illustrations and 2,305 Chemicals, This catalogue is sent 
gratis to those whose identity with regularly established laboratory work is 
fully known to us. The following reprints, however, are sent upon request. 
These cover forty-two sections of the catalogue and show the space devoted 
to these important subjects. 
No. 1 Asphalt and Tar Testing 
Apparatus, 5 pp. 
No. 2 Bacteriological, Histo- 
logical and Serological 
Apparatus, 25 pp. 
No. 
3 
Balances, 29 pp. 
No. 
4 
Calorimeters, 9 pp. 
No. 
5 
Cement Testing Appar- 
atus, 4 pp. 
No. 
6 
Centrifuges, 9 pp. 
No. 
7 
Charts, 16 pp. 
No. 
8 
Color Testing Appara- 
tus, 6 pp. 
No. 
9 
Crushing, Grinding and 
Pulverizing Apparatus, 
9 pp. 
No. 10 Dissecting Instruments, 
5 pp. 
No. 11 Distilling Apparatus, 7 
pp. 
No. 12 Electro-Chemistry Ap- 
paratus, 10 pp. 
No. 13 Furnaces, 11 pp. 
No. 14 Gas Analysis Apparatus, 
13 pp. 
No. 15 Apparatus for Haema- 
tology, 6 pp. 
No. 16 Hydrometers and Hy- 
grometers, 5 pp. 
No. 17 Specimen Jars, 7 pp. 
No. 18 Measuring Appliances, 
7 pp. 
No. 19 Metallographic Appara- 
tus, 6 pp. 
No. 20 Microscopes and Acces- 
sories, 33 pp. 
No. 21 Micro-Photographic Ap- 
paratus, 6 pp. 
No. 22 Microtomes and Acces- 
sories, 6 pp. 
No. 23 Milk Testing Apparatus, 
4 pp. 
No. 24 Apparatus for Mineral- 
ogy, Crystallography, 
Petrography, etc., 10 
pp. 
No. 25 Apparatus for the De- 
termination of Nitro- 
gen, 4 pp. 
No. 26 Oil Testing Apparatus, 
6 pp. 
No. 27 Ovens, 8 pp. 
No. 28 Photometers and Acces- 
sories, 6 pp. 
No. 29 Physical Chemistry Ap- 
paratus, 10 pp. 
No. 30 Physiological and Clin- 
ical Apparatus, 13 pp. 
No. 31 Platinum Ware, 3 pp. 
No. 32 Polariscopes and Acces- 
sories, 12 pp. 
No. 33 Projection Apparatus 
and Accessories, 10 pp. 
No. 34 Pyrometers, 10 pp. 
No. 35 Radio-Chemistry Appar- 
atus, 5 pp. 
No. 36 Refractometers, 9 pp. 
No. 37 Shaking Apparatus, 4 pp. 
No. 38 Spectroscopes, Spectro- 
graphs, Spectrometers 
Spectro - Photometers 
and Accessories, 15 pp. 
No. 39 Syringes, 4 pp. 
No. 40 Testing Apparatus for 
Paper, Yarns> Textiles, 
Rubber, Leather, etc., 
5 pp. 
No. 41 Thermometers, 6 pp. 
No. 42 Urine Analysis Appara- 
tus, 3 pp. 
ARTHUR H. THOMAS COMPANY 
IMPORTERS - DEALERS - EXPORTERS 
LABORATORY APPARATUS AND REAGENTS 
WEST WASHINGTON SQUARE 
PHILADELPHIA, U.S.A. 
Always mention the JOURNAL OF BOTANY when answering our advertisements. 
