AMERICAN MEN OF SCIENCE 



179 



teaching fellow, 93-94, A.M, 94 ; fellow, Chicago, 

 94-96, Ph.D, 96; Leipzig and Paris, 96-97. 

 Chemist, Tex. Geol. Surv, 92-93; instr. math, 

 California, 9k7-99; assoc. prof, Texas, 99-00; 

 asst. prof, Chicago, 00-07, assoc. prof, 07-10, 

 prof, 10- Visiting prof, math, California, 14; 

 mem. Nat. Eesearch Council, 19- Nat. Acad; 

 Philos. Soc; Math. Sec. (pres, 16-18, ed, 

 'Trans'); Am. Acad; London Math. Soc; cor. 

 Paris Acad; Int. Math. Union (chairman. Am. 

 sect). Theory of groups (finite and infinite); 

 theory of numbers; projective geometry; appli- 

 cations of group theory; the theory of groups in 

 a general field; invariants; history of mathe- 

 matics. 



Diefendorf, Dr. A (Hen) Ross, 108 Huntington St, 

 New Haven, Conn. Psychiatry. Savannah, N. Y, 

 Dec. 21, 71. A.B, Yale, 94, M.D, 96. Junior 

 asst. physician, Worcester Insane Hosp, 96-97, 

 senior asst. physician, 97-98: asst. physician and 

 pathologist. Conn. Insane Hosp, 98-08; lecturer 

 psychiat, med. sch, Yale, 98- Neur. Ass; 

 Medico-Psychol. Ass. Clinical psychiatry; men- 

 tal and neurological diagnosis. 



Diehl, William W(ebster), U. S. Department of 

 Agriculture, Washington, D. C. Botany. Lo- 

 gansport, Ind, Jan. 15, 91. A.B, Miami, 14; 

 M.S, Iowa State, 15. Teaching fellow, Iowa 

 State, 14-16; instr. hot, Clemson, 16-17; scien- 

 tific asst. mycol, "bur. plant indust, U. S. Dept. 

 Agr, 17-19, asst, 19- Phytopath. Soc; Iowa 

 Acad. Mycology; fungous diseases of plants; 

 mycological exchange. 



Diemer, Prof. Hugo, La Salle Extension Uni- 

 versity, 4046 Michigan Ave, Chicago, 111. Me- 

 chanical engineering. Cincinnati, Ohio, Nov. 

 18, 7<0. M.E, Ohio State, 96; A.B, Pa. State, 

 13. With Addyston Pipe and Steel Co, 88- 

 92; Westinghouse Elec. and Mfg. Co, 96- 

 98; indust. engineer, Bullock Mfg. Co, 98-00; 

 asst. prof. mech. eng, Mich. Agr. Col, 00-01; 

 assoc. prof, Kansas, 01-04; supt, Nat. Motor 

 Vehicle Co, 04-06 ; production manager, Good- 

 man Mfg. Co, 06-08 ; prof, indust. eng. Pa. 

 State, 08-19; personnel supt, Winchester Re- 

 peating Arms Co, 19-20. Consulting engineer 

 various indust. firms ; major, ordnance dept. 

 Consulting engineer for Int. Harvester Co, Atlas 

 Engine Works, Cincinnati Milling Machine Co, 

 Nat. Motor Vehicle Co. and others. A. A; 

 Mech. Eng; Eng. Educ; Acad. Polit. and Social 

 Sci; Taylor Soc; Nat. Ass. Corp. Schools; Pa. 

 Eng. Soc. Industrial economies; automobiles; 

 motor boats and motor cycles; factory organiza- 

 tion and administration; wage systems; time 

 elements in machine shop operations. 



Diemer, Dr. Melvin E(dison), Forest Products 

 Laboratory, Madison, Wis. Chemistry. Dakota, 

 111, March" 7, 87. A.B, Wisconsin, OS, A.M, 09, 

 Ph.D, 11. With forest products lab, U. S. Dept. 

 Agr, 11- Gaseous content of lake water; selenic 

 acid; aureus chlorid; scientific photography. 



Dietrich, Prof. W(tllia)m, Preston, Minn. Animal 

 husbandry. Black River Falls, Wis, March 24, 

 71. B.S.A, Wisconsin, 99; M.S, Illinois, 06. 

 Soil expert, bur. soils, U. S. Dept. Agr, 03-04; 

 instr. and later asst. prof, swine husbandry, 

 Illinois, 04-12, asst. and later asst. chief, -Exp. 

 Sta, 08-12; asst. prof, dairy and animal hus- 



bandry, Minnesota, 13-18; county agent, Fill- 

 more Co, Minn, 18- A. A; Soc. Animal Nutri- 

 tion. Animal nutrition ; swine husbandry. 

 Dietz, Harry F(rederic), U. S. Department of 

 Agriculture, Washington, D. C. Entomology. 

 Indianapolis, Ind, Dec. 8, 90. A.B, Butler, 14; 

 Ohio State, 16. Asst. state entomologist, Ind. 

 14-16; entom. inspector, fed. hort. board and 

 bur. entom, U. S. Dept. Agr, 17- A.A; Entom. 

 Soc; Ass. Econ. Entom; Ind. Acad; Ohio Acad. 

 Coccidae of Indiana; insect pests of the Canal 

 Zone. 



Dietz, S. M, 158 Hyland, Ames. Towa. Plant 

 pathology. Garner, Iowa, April 6, 93. B.S.A, 

 Iowa State, 17, M.S, 18. Field asst. cereal in- 

 vestigations, bur. plant indust, U. S. Dept. Agr, 



17, asst. pathologist, IS- Second lieut, F. A, 



18. Phytopath. Soc. Rust of oats; resistant 

 varieties; limits of the host. 



Diggs, Dr. S(terling) H(enry), 1074 Superior 

 Ave, W^hiting, Ind. Chemistry. Mathews Co, 

 Va, May 16, 79. B.S, M.S, Virginia, 12, Ph.D, 

 14. Instr. physics, Virginia, 10-11, psychol, 12- 

 13, chem, 13-14; research chemist. Standard Oil 

 Co. of Ind, 14- Teacher physics and psychol, 

 Virginia, summer sch. Chem. Soc. Diffusion of 

 iodin; reactions of phosphorus and copper; 

 racial psychology. 



Dike, Prof. Paul H(arrison), Robert College, Con- 

 stantinople, Turkey. Physics. "Crystal Lake, 

 111, Feb. 22, 78. B.S, Northwestern. 01, fellow, 

 02-03, M.S, 03; Berlin, 05-06; Cambridge. 06; 

 Ph.D, Wisconsin, 11. Magnetic observer, TJ. S. 

 Coast and Geod. Surv, 04-05; dept. terrestrial 

 magnetism, Carnegie Institution, 0.5-09; asst. 

 physics, Wisconsin, 09-11; Cornell, 11-14; instr, 

 Missouri, 14-15; prof, Robert Col, Constanti- 

 nople, 15- Lieut, Sig. C, A.E.F, 17-19; acting 

 scientific attache, U. S. Embassy, Paris, 19. 

 A.A; Physical Soc. On magnetic surv. yacht 

 'Galilee,' 07-08. Radioactive emanation in at- 

 mosphere; atmospheric electrical conductivity at 

 sea; dip circle corrections; photo-electric poten- 

 tials; radio telegraphy; sound ranging of air- 

 planes. 



Dill, Prof. Homer Il(ay), State University of 

 Iowa, Iowa City, Iowa. Zoology. Gardiner, 

 Maine, Oct. 30, 77. Curator, Maine State Mu- 

 seum, 00-06; taxidermist, Brooklyn Museum; 

 asst. prof. zool. and director, vert, mu.teum, dept. 

 zool, Iowa. In charge, exped. to Laysan Isl, 

 11; La. Gulf Coast, 18, 19; Cascade Mountains, 

 20. Iowa Acad. Ornithology; habits of Laysan 

 birds. 



Diller, J(oseph) S(ilas), U. S. Geological Survey, 

 Washington, D. C. *Geology, Petrography. 

 Plainfield, Pa, Aug. 27, 50. B.S, Harvard, 79; 

 Heidelberg, 80-83. Teacher, State Nor. Sch, 

 Westfield, Mass, 73-77; geologist, Assos exped, 

 81-82; U. S. Geol. Surv, 83- Assoc, ed, 'Am. 

 Jour, of Science.' Diploma. Paris Expos, 00. 

 A.A; Geol. Soc. (v. pres, 07); Wash. Acad, 

 (rec. sec'y, 08); Wash. Geol. Soc. (pres, 01); 

 Wash. Philos. Soc. (sec'y, 88-94). General and 

 economic geology; petrography; geology of 

 Crater Lake National Park, Lassen Peak, Red- 

 ding, Klamaih Mountains and Taylorsville re- 

 gion in California; sandstone dikes; igneous 

 rocks of Pacific Coast; chromite; asbestos; talc. 



