SCIE 



New Series. 

 Vol. VII. No. 170. 



Friday, April 1, 1898. 



Single Copies, 15 cts. 

 Annual Subsckipiion, $5.00. 



General Electric Co.'s 



FLUOROSCOPES 



Platino=cyanide of Barium, or Tungstate of Calcium Screens. 



NEW X=RAY TUBE *'™virur"^ouL.ATOR. 



EFFICIENT. 



LONG-LIVED. 



ROENTGEN RAY APPARATUS of all kinds. 



Catalogue No. 9050. 



Candelabra, Miniature and Decorative Lamps. 



Catalogue No. 9044. 



EmsoQ Decorative aail iQlatore Laip Departineiil 



^GENERAL ELECTRIC COMPANY,) 



HARRISON, N. J. 



SHELLS. 



Ovula ovum, 15 to 50 cents. Vasum 



turbinellum, 25 to 40 cents. Voluta 



-'^ rutila and V. piperita, $1.50 to $3. Sepia hercules, from Australia, 



Jj $1 to $3. Scientific, Curious and Eare Shells from every clirue. 



WARDS NATURAL SCIENCE ESTABLISHMENT, 18-28 College Ave., Rochester, N. Y. 



y^m9mm»9»m»^9««^ W Will Interest You •'«99©^*^»**^*^»*a^ 



I published it for no other reason. On April 1st I published the first number of my little monthly 

 paper 



Biddle's Bulletin 



It contains information of use to scientific men, professional or amateur. It is not solely devoted 

 to my business, but I try to make it interesting apart from that. The subscription is 50 cents a 

 year, but if you will send me' your name and the line in which you are interested, you shall have 



it FEKE FOE THREE MONTHS. Write nOW. 



JAMES Q. BIDDLE, Publisher, 



909 Drexel Building, Phila. 



