(pj. Jy/.A/ 

 cs-/ 



SECTION I, PART III 



Section II, Part I 



An 



Introduction 



To 



NEMATOLOGY 



B. G. CHITWOOD. Babylon, N. Y. 



A. C. WALTON. Knox College. Galesbury, 111. 



REED O. CHRISTENSON, Dept. Zool.-Ent., 



Alabama Exper. Sta., Auburn. Ala. 



M. B. CHITWOOD, Babylon, N. Y. 

 LEON JACOBS, Washington, D. C. 

 F. G. WALLACE, Dept. Zool., Univ. Minnesota, 

 Minneapolis, Minn. 



QL . 

 391. N 

 C 57 



MAURICE CROWTHER HALL 



1881—1938 



Born in Golden, Colorado; B.S., Colorado College (1905); A.M., University 

 of Nebraska (1906); Ph.D., George Washington University (1915); D.V.M., George 

 Washington University (1916); Sc.D., Colorado College (1925); High School Teacher, 

 Colorado (1906-1907); U. S. Dept. Agric, Junior Zoologist (1907-1911), Assistant 

 Zoologist (1911-1916); Parasitologist, research lab. Parke Davis & Co. (1916-1918); 

 First Lieutenant, U. S. Army (1918); Senior Zoologist, U. S. Dept. Agric. (1919-1925); 

 Chief, Zoological Division, U. S. Dept. Agric. (1925-1937); Chief, Zoological Division, 

 National Inst. Health (1937-1938). 



Helminthologist, discoverer of the efficiency of carbon tetrachloride and tetra- 

 chlorethylene for removal of ascarids and hookworms, parasitologist, philosopher, 

 sociologist, strategist and tactician in the war against parasites, author of "Drama 

 anthelmintica", and an ideal scientific leader and director. 



Copyright, 1940, by M. B. Chitwood 



