SCIEN 



Feiday, Septembee 21, 1900. 



Single Copies, 15 CTS. 

 Annual Suescbiption, 86.00. 



Chemicals a nd Chemica l Apparatus 



SOLE AGENTS FOR 



Schmidt & Haensch's Polariscopes 



FOR SUGAR AND URINE ANALYSIS 



KOCH'S Incubator 



NEW AND IMROVED FORM TO WORK WITH A PETROLEUiVI LAMP 

 INDISPENSABLE WHERE GAS IS NOT AVAILABLE 



Furnished in Four Different Styles and Sizes from $25.00 upwards 



ElMER & Amend, IVew Vork: 



^ \ 



Standard Mica Condenser 



Scientific Apparatus 



FOB 



ELECTRICAL ENGINEERING and 



PHYSICAL LABORATORIES 



If you have not already received a copy, write for Catalogue B 

 (2d edition) "Electrical Measuring Instruments." Contains over 

 120 pages, well illustrated. Issued June, 1900. 



A Specialty of "Duty Free" Importations from Soci^te Gene- 

 voise and other prominent European makers. 



James G. Biddle 



1034 Drexel Building PHILADELPHIA 



Bf Smith Premier Typewriter 



Received greatest number of points for superiority at the PARIS 

 EXHIBITION, and was awarded a DIPLOMA of the GRAND 

 PRIX for its superiority of construction and efficiency at the 

 HIGHEST RATING of the Jury. This Grand Prix was won by 

 the Smith Premier in competition with twenty other typewriters on 

 exhibition. 



The Smith Premier Typewriter Go. 



337 Broadway, New York ^ 



