| DRUGGISTS, PHYSICIANS, ASSAYERS, DYERS, PHOTOGRAPHERS, |
| MANUFACTURERS. |
| |
| And all concerned in scientific pursuits. |
| |
| Subscription, $5.00 per annum, in advance; 50 cts. per |
| number. Specimen copies, 25 cts. |
| |
| Address WILLIAM BALDWIN & CO., |
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| Publishers and Proprietors, |
| |
| 434 _Broome Street, New York_. |
| |
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| |
| GEORGE WEVILL, |
| |
| WOOD ENGRAVER, |
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| 208 BROADWAY, |
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| NEW YORK. |
| |
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| GEO. B. BOWLEND, |
| |
| Draughtsman & Designer; |
| |