May 21, 1920] 



SCIENCE 



513 



teaching of tlie origin and cause of disease and 

 its prevention and for the study and teaching 

 of dietetics. 



Howard University School of Medicine, 

 Washington, has been promised $350,000 by the 

 General Education Board, provided the medical 

 school succeeds in raising the rest of a total 

 sum of $500,000. 



The trustees of the University of Southern 

 California, on April 13, decided to suspend 

 temporarily the medical department because of 

 inadequate endowment with which to main- 

 tain it. 



, Dr. Cornelius Betten, secretary of the 

 State College of Agriculture at Cornell Uni- 

 versity, has been apix)inted vice-dean of the 

 college. 



Curt Eosenow (Ph.D., Chicago, 1917), of 

 the Juvenile Psychopathic Institute, Chicago, 

 has accepted an assistant professorship in psy- 

 chology at the University of Kansas. 



Dr. a. Richards, professor of zoology at 

 "Wabash College, has been appointed to a pro- 

 fessorship of zoology in the University of Okla- 

 homa, where he will be head of the department. 



^ Dr. Pred Hoffmann Ehodes has been ap- 

 pointed professor of industrial chemistry and 

 will begin his work in the autumn at Cornell 

 University. 



, General Sm Arthur Currie has accepted 

 the position of principal of McGill University 

 in succession to Sir Auckland Geddes, who re- 

 signed to become British Ambassador at 

 Washington. 



DISCUSSION A'ND CORRESPONDENCE 



FORMULAE GIVING THE DAY OF THS WEEK 

 OF ANY DATE 



To officials who are required to fix the dates 

 of events beyond the end of the current year 

 and to historians who may desire to know the 

 day of the week of events in past years, for 

 which calendars are not ordinarily available, 

 the formulse given below may be of consider- 

 able interest. 



When the days of the week are numbered 

 thus: 



Sun. Mon. Tue. Wed. Thu. Fri. Sat. 

 12 3 4 5 6 



the day of the week of any date in the Gregor- 

 ian (ISTew Style) calendar is the remainder, 

 B, in the division 



(¥ + 3C + F + L + M+D)/7 = Q+' Jt/7, 



in which the symbols used have the follow- 

 ing meanings: 



Q is the integral part and B the remainder 

 obtained in the division indicated in the first 

 member of the equation. 



Y is the year in which the date occurs. 



C is the number formed by striking out the 

 last two digits of the year. Thus, for dates 

 in the year 1920, C = 19. 



F is the number of preceding leap days 

 occuring in centennial years. These occur in 

 the years 400, 800, 1200, 1600, etc. Thus, for 

 dates between 



Jan. 1, 1, and Feb. 29, 400, inclusive, i? = 



Mar. 1, 400, " " " 800, " F = 1 



Mar. 1, 800, " " " 1,200, " F=z2 



Mar. 1,1,200, " " " 1,600, " F — Z 



Mar. 1,1,600, " " " 2,000, " F — i 



L is the number of leap days between the 

 date and the last centennial year (not in- 

 clusive). It it the quotient obtained by 

 dividing by four the number formed by the 

 last two digits of the year in which the last 

 preceding leap day occurred. 



M is a nimiber which varies from month to 

 month as follows: , 



Jan. Fob. Mar. Apr. May June 



3 3 6 1 4 



July Aug. Sep. Oct. Nov. Deo. 



6 2 5 3 5 



D is the day of the month. 



