SCIENCE— ADVERTISEMENTS 



Jnst Issued 



KOFOID and SWEZY 



Mitosis and fission in the active and encysted 

 phases of Giardia enterica (Grassi) of Man. 

 50 cents. 



Mitosis in Endamoeba dysenteriae in the bone 

 marrow in Arthritis deformans. 



Endamoeha dysenteriae in the lymph glands 

 of Man in Hodgkin's disease. 



In one cover, 25 cents. 



Mitosis in the encysted stages of Endamoeba 

 coli (Losch). (In press), 30 cents. 



University of California Press 



Berkeley, California 



NEW BOOKS FOR SCIENCE LIBRARY 

 RICHTER. Organic Chemistry, Vol. 2 



Thf Carbocyclic Series. Trans, by E. E. F. D'albe. 

 Clolh, S8.00. 



PAULI. Colloid Chemistry of The 

 Proteins 



Illus. By Phof. Dr. F. Pauli (Vienna), Cloth, 82.25. 



HATSCHEK. Physics And Chemistry of 

 Colloids 



■Ith Edition. niuslrated. Cloth. S2.25. 



YOUNGKEN. Textbook of Pharmacognosy 



By H. W. YoLNCKUN, Ph.D. 210 illus. Clolh, S6.00 



PITFIELD. Compend of Bacteriology 



Includes animal parasitics. 4th Edition. 86 illus- 

 trations. Cloth, S2.00. 



ATWOOD. Civic and Economic Biology 



By PKor. W. H. ATWOon. Illustrated. Cloth, 31.68, 



JENKINS. Interesting Neighbors 



By Prof. Oliver P. Jenklns. 81 illus. Cloth, J1.12. 



LEE. Microtomist's Vade Mecum 



By ,\. B. Lee, F.R.M.S. 8th Edition. Clolh, $6.50, 



SKUTTLEWORTH and POTTS. Mentally 

 Deficient Children 



Treatment and Training. 5th Edition. Illustrated. 

 Cloth. S3.25. 



STODDART. Mind And Its Disorders 



J-lh Edition. 85 illustrations. Cloth, S7.50. 



P. BLAKISTON'S SON & CO. Philadelphia 



For Demonstrating and Detecting 



s 



Hammer's Spinthariscope 



is a device to illustrate 

 the spontaneous disinteg- 

 ration of ratiium. Alpha 

 rays expelled from radium 

 ore strike a screen of 

 phosphorescent zinc sulphide causing bril- 

 liant flashes of light which can be observed 

 through a high-powered magnifying glass. 



Price complete as shown $4.00 



Phosphorescent zinc sulphide screens 



4" X 4' each 2.00 



Hammer's Radioscope 



is an instrument for 

 detecting the presence 

 o f radio-activity in 

 water, ores, etc., by 

 the scintillation meth- 

 od, which is the most 

 sensitive of all meth- 

 ods for determining 

 the presence of ra- 

 dium. 

 Price complete, $10.00 



Headquarters on Radiufti Apparatus 

 For Sale by 



The Denver Fire Clay Company 



Denver, Colorado [l^^ Salt Lake City, Utah 



