43G 
SCIENCE 
NEw SERIES. SINGLE Copiss, 15 cts. 
Vou. VI. No. 153. F RIDAY, DECEMBER 3, 1897. ANNUAL SUBSCRIPTION, $5.00. 
GENERAL ELECTRIC Co.’s 
FLUOROSCOPES 
Platino-cyanide of Barium, or Tungstate of Calcium Screens. 
NEW X-RAY TUBE vacuum ReauLaror. 
SIMPLE. EFFICIENT. LONG=LIVED. 
ROENTGEN RAY APPARATUS of all kinds. 
Catalogue No. 9050. 
Candelabra, Miniature and Decorative Lamps. 
Catalogue No. 9044. 
Edison Decorative ane Miniature. Ue Lamp Department, 
(GENERAL ELECTRIC COMPANY,) 
HARRISON, N. J. 
F @) S SIL A large series of both AMERICAN and FOREIGN Fossils from the 
© LAURENTIAN to the QUATERNARY and from PROTOZOA to 
MAN; also casts of over 1000 unique or exceptionally perfect specimens, models, diagrams, ete. 
Systematic Collections for Schools and Colleges ranging in value from $20 to $1200. Many 
fine and rare things for specialists; clear, typical specimens for private collectors. Write 
for circular. Also Mineralogy, Geology, Zoology and Archzology. 
Ward’s Natural Science Establishment, 
18 to 28 College Ave., Rochester, N. Y. 
Scientific Apparatus. 
It is my business to equip Physical, Psychological 
and Electrical Laboratories. I have ample facilities 
as well as the benefit of more than 10 years’ experi- 
ence. Am closely connected with the best manufac- 
turers in the United States and Europe. 
Particular attention to ‘‘ Duty Free’? Importations. 
Correspondence solicited. 
As Special Agent I represent The Electric Storage 
Battery Co., and Weston Electrical Instrument 
Co. Catalogues mailed upon request. 
JAMES G. BIDDLE, 909 Drexel Building, Philadelphia 
240 
