584 RECORD OF MEETINGS OF THE 



Professor Lee discussed temperature and muscle fatigue. He 

 and others have previously pointed out that the contraction 

 process of the muscles of cold-blooded animals in the course 

 of fatigue becomes greatly slowed, while those of warm-blooded 

 animals show no such phenomenon. Lohmann has recently 

 claimed that a cold-blooded muscle on being heated to a mam- 

 malian temperature shows a course of fatigue similar to that of 

 mammalian muscle; and, on the other hand, that a warm- 

 blooded muscle on being cooled fatigues like the muscles of 

 cold-blooded animals at a similar temperature. From these 

 supposed effects he infers that in the matter of fatigue there is 

 no real physiological difference between the two groups of 

 muscle. Professor Lee has not been able to confirm Lohmann's 

 conclusions. Every variety of muscle which has been tested, 

 whether of cold-blooded or warm-blooded animals, shows its 

 characteristic method of fatigue, whatever the temperature 

 may be. The original conclusion regarding the difference 

 between the two groups of muscles seems, therefore, to be 

 justified. M. A. Bigelow, 



Secretary. 



SECTION OF ASTRONOMY, PHYSICS, AND CHEMISTRY. 

 March 20, 1905. 



Section met at 8.15 p. m., Vice-President von Nardroff pre- 

 siding. 



The minutes of the last meeting of the Section were read 

 and approved. 



The following program was then offered : 



S. A. Mitchell, The Sixth Satellite of Jupiter. 



E. R. von Nardroff, A Pocket Form of the Piezic Barometer. 



George F. Kunz, Exhibition of the U.S. Geological Sur- 

 vey Radium Exhibit, which was Shown 

 at the St. Louis Exposition. 



L. G. Cole, Rectilinear Rontgen Rays. 



