64 BULLETIN OP THE 



Mr. HiLGARD regarded it a meteorological, and not a physio- 

 logical, instrument ; and spoke of the value of the ordinary 

 meteorological observations as giving much information on 

 climates of different regions, from which their effects on man 

 may be deduced. 



Mr. Woodward doubted the precision of the instrument ex- 

 hibited ; and spoke of the practical difficulty in obtaining homo- 

 geneous porous-paper, and in constructing several instruments, 

 which would agree in their indications. 



Mr. George B. Dixwell, of Boston, made a communication on 



CYLINDER CONDENSATION, STEAM JACKETS, AND SUPERHEATED 



STEAM : 



giving an extended abstract of a pamphlet, which he had pub- 

 lished on these subjects. 



Prof. A. M. Mayer, of Hoboken, N. J., made a communica- 

 tion on 



A METHOD OP DETERMINING A DEFINITE INTERVAL OP TIME, AND 

 ITS APPLICATION TO MEASURING THE NUMBER OP VIBRATIONS 

 OP SOLID BODIES. 



Mr. HiLGARD and Mr. Harkness participated in the discus- 

 sion which followed. 



98Tn Meeting. January 15, 1876. 



The President in the Chair. 

 Forty-three members and visitors present. 

 Mr. J. J. Woodward made 



REMARKS on THE PAPYRUS EBERS, 



exhibiting and describing two quarto volumes, with colored plates, 

 of an Egyptian medical work written 1552 years before the Chris- 

 tian era, and probably the oldest medical work extant. The vol- 

 umes contained the hieratic text and translations into hiero- 

 glyphics and German. 



