138 TKANSACTIOXS OF THE [MaR. 13 



SECTION OF ASTRONOMY AND PHYSICS. 



The Section was called to order at 8:20 p. m., Professor Rees 

 in the chair. 



A paper was read by Mr. C. A. Post on " A New Driving 

 Clock for Equatorials " The apparatus described has been in 

 successful operation for more than a year. It involves a new 

 method of control (not electric), and a new differential slow 

 motion for photographing. This slow motion can be applied in 

 in either direction without stopping the clock, or changing its 

 rate. 



Mr. Jacoby communicated the results of some measures made 

 by him upon Mr. Rutheiifurd's plates of (3 Cygni. These 

 additional measures seem to confirm the existence of a large 

 parallax for this star. 



Professor Rees exhibited a photograph of a meteor trail, 

 recently obtained by Mr. John E. Lewis, of Ansonia, Conn. 



March 13, 1893. 



Stated Meeting, 



Mr. Charles F. Cox in the chair, and 72 persons present. 



The minutes of the meeting of February 23, 1893, were read 

 and approved. 



The following paj)ers were read by title and referred to the 

 Publication Committee : 



"The Myriopoda collected by the United States Eclipse 

 Exploring Expedition to West Africa in 1889 and 1890," by O. 

 F, Cook and T, S. Collins. 



" Studies on the Life-History of some Bombycine Moths, 

 with Notes on the Setse and Spines of certain Sj)ecies," by 

 Alphaeus S. Packard. 



BIOLOGICAL SECTION. 



Professor G. S. Huntington, in a paper on "Anomalies 

 of Pectoralis, major and minor," referred to the value of those 



