450 



SCIENCE 



[N. S. Vol. XLII. No. 1083 



and sanitation, which has been organized with 

 the following appointments: Eugene M. Mc- 

 Campbell, M.D., professor of preventive medi- 

 'cine and head of the department; Robert G. 

 Patterson, A.B., A.M., assistant professor of 

 public health; Emery R. Hayhurst, M.D., 

 sissistant professor of industrial hygiene; 

 William H. Dittoe, C. E., instructor in public 

 health engineering ; Frank G. Boudreau, M.D., 

 instructor in public health and sanitation; 

 Lear H. Van Buskirk, B.Sc., instructor in 

 public health laboratory methods. 



The following appointments have been 

 made to the faculty of Case School of Applied 

 Science: Keith F. Adamson, the University 

 of Pennsylvania, assistant professor of me- 

 chanical engineering; Melville F. Coolbaugh, 

 the South Dakota School of Mines, assistant 

 3)rofessor of chemistry; Roy E. Spencer, Har- 

 yard University, instructor in English; 

 IJawrence G. Wesson, Harvard University, 

 instructor in organic chemistry; Carl H. 

 "Wilson, Harvard University, instructor in 

 -.iahemistry ; Arthur E. Bradley, recently of Cor- 

 nell University, instructor in civil engineer- 

 ing; Allan A. Prior, Harvard University, in- 

 structor in electrical engineering; Perry F. 

 Ellsworth, the Edison Electric Company, in- 

 structor in electricity and drawing; R. B. 

 Reis, the Westinghouse Electric Company, in- 

 structor in mechanical engineering; H. F. 

 Pasini, graduate of the Y. M. C. A. Training 

 School of Springfield, director of the gym- 

 nasium; Bohlis Dahlman, instructor in gym- 

 nastics. 



Professor H. F. Wilson, of Oregon State 

 College, has gone to the University of Wis- 

 consin as professor of economic entomology 

 to take the place of Professor J. G. Sanders, 

 who has become state entomologist for Wis- 

 consin. 



De. R. G. Pearce, associate in physiology. 

 Western Reserve University, has been ap- 

 pointed assistant professor of physiology in 

 the college of medicine. University of Illinois, 

 Chicago. 



Dr. James Craig Neel has been appointed 

 instructor in obstetrics and gynecology (on an 



academic basis) in the University of Cali- 

 fornia Medical School. 



S. H. E. Barraclough, lecturer at the Uni- 

 versity of Sydney, has been appointed to the 

 chair of mechanical engineering. 



DISCUSSION AND COBSESPONDENCE 



A PROPOSED CLASSIFICATION OF THE ATTITUDE OF 

 GEOLOGIC SURFACES 



The familiar classification of folds has long 

 been used by the geologist in working with oil 

 and gas. Its inadequacy for his purposes is 

 apparent when one considers that the deter- 

 mining factor in the gravitational separation 

 of gas, oil and water is not the general plane 

 of the bed, but the actual surface constituting 

 the roof or floor of the reservoir. This may 

 differ from the general plane of the bed due 

 not only to irregularity of deposition, but also 

 to irregularity of cementation, since the res- 

 ervoir frequently constitutes only a portion of 

 the sandstone bed. A mere classification of 

 folds will not suffice, because it is the upper or 

 the lower surface which concerns us, and they 

 are frequently not parallel. 



A lenticular bed which lies in general hori- 

 zontal is not a fold at all, nor is one lying in 

 a plane monocline. Tet the upper and lower 

 surfaces of either of these have an attitude 

 which is of great moment to the oil geologist, 

 and must be considered along with the folded 

 surfaces. 



The following classification of geological 

 surfaces is therefore presented here in the be- 

 lief that it will be applicable to other geolog- 

 ical problems as well as to those of the oil and 

 gas geologist. There are four prime divisions : 



1. Acline — ^no inclination. 



2. Monocline — inclination in one general 

 direction. 



3. Anticline — inclination away from a point 

 or axis. 



4. Syncline — inclination toward a point or 

 axis. 



Acline 

 The acline is of small importance because 

 one finds so generally that there is at least a 



