SCIENCE 



New Series. 

 Vol. IX. No. -1 



Friday, February 3, 1899. 



Single Copies, 15 CTs. 

 Annual Subscbiption, $5.00. 



Static Machines 



for all purposes. 



X=Ray Apparatus 



and Supplies. 



SEND FOR BULLETIN No. 24. 



SWETT & LEWIS CO. 



9 Bromfield St., Boston, Mass. 



FOSSILS. 



The attention o£ Teachers of Geology and Physiography is 

 called to our systematic collections of Fossils ; $20.00 and 



upwards. We also make up Special Collections to illustrate the different text-books. 



Our new circular on Ameeican Palaeozoic Coeals, Brachiopod and Teilobitk 



Models, will be mailed on request. 



ward's natural science establishment, rochester, n. y. 



mutiature incandescent lamps, 

 miniature lamp receptacles, 

 x-ray tubes and apparatus, 

 fluoroscopes — . 



Catalogues on Application. 



Edison Decorative and Miniature Lamp Department, 



iGENERAL Electric Company,) 



HARRISON. N. J. 



Biddle's Bulletin for 1899"^^**^**^^^^% 



* I began to publish this eight- page paper in April, 1898. It has not changed in size but there 



® is improvement in quality, I hope. For 1899 I shall try to make it still more interesting. 



|s It should prove of real value (much greater than the cost of a yearly subscription) to all who 



& are interested in Scientific Apparatus — Physical Apparatus, Electrical Measuring Instruments, 



^ Projection Apparatus, X-Ray Apparatus, Psychological Apparatus, Storage Batteries, etc- 



ft Some have received the Bulletin free until now but I can't be expected to keep that up. 



S The subscription price is SO cents a year. It should be remitted at once for 1899. Sample copy 



ft upon request. 



t specialist in JAMES Q. BIDDLE, 



m Scientific and Electrical Instruments. 909 Drexel Building, Philadelphia 



