Eorl E. Huebotter received his B.S. degree 

 in chemical engineering from the Rice In- 

 stitute in Houston, Texas, in 1937. After 

 graduation he was employed by Baroid as a 

 chemical engineer and did research and de- 

 velopment work on drilling fluids. He at- 

 tended Massachusetts Institute of Technology 

 during the summer of 1939 and 1940 to do 

 advanced work in colloidal chemistry. He 

 also has served as a field drilling fluid en- 

 gineer in the Gulf Coast, Mid-Continent, and 

 Pacific Coast oil fields. He is Assistant Tech- 

 nical Director of the Drilling Fluid Labora- 

 tories of the Baroid Division of the National 

 Lead Company in Houston, Texas. 



H. A. Ireland, a native of Chattanooga, Ten- 

 nessee, received his A.B. degree from Ohio 

 Wesleyan University in 1925, his M.S. degree 

 from the University of Oklahoma in 1927, and 

 his Ph.D. degree from the University of Chi- 

 cago in 1935. He has 37 publications to his 

 credit. He is now a professor of geology at 

 the University of Kansas. Dr. Ireland has 

 been over the years an ardent contributor to 

 the problem of insoluble residues — a research 

 investigation initiated in 1929. 



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