philosophical society of washington. 53. 



25th Meeting. April 20, 1872. 



The President in the Chair. 

 Mr. J. E. HiLGARD made some remarks 



ON HINDOO ARITHMETIC. 



The same gentleman also presented as a second communication, 

 one 



ON THE RECORDING SYSTEMS OP THE TRANSATLANTIC CABLES. 



Mr. Joseph Henry made a verbal report 



ON THE expenditure OF THE INCOME OF THE BACHE FUND FOR 1872. 



Prof. J. C. Watson, of Ann Arbor, Mich., made some remarks 



ON the DISCOVERY OF NEW PLANETS HAVING ESPECIAL REFERENCE 

 TO THE ASTEROIDS. 



Major King, of New York City, made a communication 



ON THE FATIGUE OP METALS. 



26th Meeting. May 4, 1872. 



The President in the Chair. 

 Mr. Wm. Ferrel read a paper 



ON THE effects OF WINDS AND BAROMETRIC PRESSURE ON THE TIDES 

 AT BOSTON, AND ON THE MEAN LEVEL OF THE SEA. 



(This paper is published in substance in the American Journal of Science, 3c? 

 series, Vol. V., pp. 342-347, May, 1873.) 



(ABS TK AC T.) 



This paper related to some recent results which the author had 

 obtained from the discussion for the Coast Survey of the tidal 

 observations of Boston harbor. These results pertain mostly to 

 the effects of chan2:es of the barometric pressure, and of the 

 winds upon the mean level of the sea. The author found that 

 the variation of mean level was inversely to that of the height 

 of the mercurial column as seven inches of mean level to one inch 



