Leitz Microscopes! 



and Microscopical Accessories, 

 Microtomes, Etc. 



are recognized by leading 

 scientists as the standard of 

 perfection, involving all that 

 the greatest degree of skill 

 and scientific knowledge can 

 produce. 



We have sold more 

 than 155,000 Mi- 

 croscopes and more 

 than 65,000 Oil 

 Immersion Objec- 

 tives to satisfied 

 users all over the 

 world, a record not 

 attainable elsewhere 



Leitz fatuous Prism 

 Binoculars are op- 

 tically and mechan- j^^itz Special Physicians" 

 ically unsurpassed. anri Students' Miorosoope. 



ERNST LEITZ 



Wetzlar, Germany 

 U. S. Branch:— New York, 30 East 18th Street 



FERGUSON 

 LABORATORIES 



121 West 42d Street 



NEW YORK CITY 



TELEPHONE BRYANT 4863 



Professor GEORGE A. FERGUSON, Director 



Testing, microscopical examination 

 and chemical analysis of ores, alloys, 

 drugs, pharmaceuticals, food and food 

 products, chemicals, water, etc. 



Examination of urine, sputum, blood 

 and other clinical and pathological 

 specimens. 



Working formula for proprietary, 

 toilet and other preparations. 



Special expert service rendered in 

 medico<=legal cases. 



