238 



SCIENCE 



[N. S. Vol. XLIV. No. 1129 



Dr. B. M. Strong has resigned the chair of 

 anatomy at the University of Mississippi to 

 accept the position of associate professor of 

 anatomy in the medical school of Vanderbilt 

 University, Nashville, Tenn. 



The following appointments to the faculty 

 of the University and Bellevue Hospital Medi- 

 cal College have been announced : Dr. William 

 C. Lusk, professor of surgery; Dr. Joseph B. 

 Bissell, Dr. Thomas A. Smith, and Dr. Arthur 

 M. Wright, clinical professors of surgery; Dr. 

 W. Howard Barber, chief of clinic, depart- 

 ment of surgery; Dr. George Francis Cahill, 

 instructor in surgery; Dr. Theodore J. Abbott, 

 clinical professor of medicine; Dr. Benjamin 

 M. Levine, clinical professor of cancer re- 

 search; Dr. Charles Krumwiede, Jr., assistant 

 professor of bacteriology and hygiene; Miss 

 Mary Smeeton, instructor in bacteriology. 



Promotions in the philosophical and engi- 

 neering faculties of the Johns Hopkins Uni- 

 versity has been made as follows: Knight 

 Dunlap, professor of experimental psychology; 

 Joseph C. W. Erazer, professor of analytical 

 chemistry; E. Emmet Eeid, professor of or- 

 ganic chemistry; Grandville E. Jones, as- 

 sociate professor of civil engineering; Paul B. 

 Davis, associate in chemistry; William B. 

 Kouwenhoven, associate in electrical engi- 

 neering. 



DISCUSSION AND CORRESPONDENCE 



CULTURE MEDIA FOR PARAMECIA AND 

 EUGLENA 



A communication to this journal by J. B. 

 Barker, entitled " A Method of Maintaining a 

 Supply of Protozoa for Laboratory Use," 1 

 brought to my mind a culture medium which 

 I used at the University of Chicago for a few 

 years and found thoroughly reliable. The 

 method was given to me by one of my assist- 

 ants at the time, Mr. John G. Sinclair, who 

 according to my recollection had obtained it 

 from Dr. A. W. Peters, of the University of 

 Hlinois. 



Enough wheat to make about one half gram 

 per liter of the culture solution is boiled in a 



i Science, November 19, 1915, p. 727. 



small quantity of water for a few minutes. 

 (The original method as given to me called for 

 cracked wheat, but I obtained good results with 

 whole wheat.) The boiled wheat is then placed 

 in tap water in the ratio indicated above, and 

 the solution is inoculated either from some 

 culture of paramecia already on hand or with 

 pond water. In most cases, I used water taken 

 from the immediate vicinity of submerged 

 pond vegetation. It was my custom to use 

 large battery jars for the culture media, which 

 were placed with glass covers on a table in the 

 room where the paramecia were to be used. 

 In the course of a week or so, depending upon 

 the room temperature, I was always able to 

 obtain an abundance of large paramecia. 



A method for Euglena was also given to me, 

 but I never used it, having no occasion to need 

 this protozoan. I presume the method is 

 equally good. One half gram of rice per liter 

 of culture solution is washed thoroughly and 

 drained. The washed rice is then boiled for 

 about five minutes and put into tap water. 

 After inoculation, the solution is placed where 

 it may obtain direct sunlight. 



The directions also state that it is advisable 

 to add about one fourth gram of boiled grain 

 (rice or wheat according to the culture) per 

 liter of the medium, every three weeks and 

 also just before use by a class begins. Eur- 

 thermore, it is desirable to stir the solution 

 every few days for an oxygen supply. 



E. M. Strong 



SEVERE RESTRICTIONS TO NORMAL GEO- 

 GRAPHIC CYCLE 



The formulation of the conception that 

 there is a distinct cycle of corrasive develop- 

 ment through which all land-forms must pass 

 is now generally recognized to be one of the 

 first half-dozen brilliant achievements in geo- 

 logic science of the century just closed. Like 

 many broad generalizations, this one is, upon 

 critical submission to quantitative measure- 

 ment, found to be too sweeping in its char- 

 acter. Close inspection soon discovers that 

 there are grave complications in the normal 

 scheme. Already the latter has to be espe- 

 cially adapted to fit, on the one hand, condi- 



