SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 93. NUMBER 1 



THE EFFECT OF ULTRAVIOLET RADIATION ON 



THE OVA OF THE ASCARID ROUNDWORMS 



TOXOCARA CANIS AND TOXASCARIS 



LEONINA 



BY 



W. H. WRIGHT 



Zoological Division, Bureau of Animal Industry, 



U. S. Department of Agriculture 



AND 



E. D. McALISTER 



Division of Radiation and Organisms, 



Smithsonian Institution 



(Publication 3291) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



DECEMBER 26, 1934 



