RECORDS 4:77 



ances arc to each other inversely as the two corresponding ca- 

 pacities. The apparatus has been employed in the Columbia 

 University laboratory and gave complete satisfaction. It is 

 capable of a tolerably high degree of accurac>% but its principal 

 merit is its convenience. 



Professor J. K. Rees presented a paper by Miss C. E. Fur- 

 ness on "A Catalogue of Stars Within One Degree of the North 

 Pole and the Optical Distortion of the Helsingfors Astropho- 

 tographic Telescope." The paper gave the results of measure- 

 ments on 65 stars. By using stars near the Pole, the same 

 group of stars can be taken at different angles with reference to 

 the object glass of the telescope. At Helsingfors the Pole is 

 sufficiently far from the horizon to avoid trouble with refraction. 

 From the measurements, the distortion of the Helsingfors lens 



was found to be not appreciable. 



Wm. S. Day, 



Secretary. 



SECTION OF BIOLOGY. 



April 9, 1900. 



Section met at 8:15 P. M., Professor F. S. Lee presiding. 

 The minutes of the last meeting of Section were read and ap- 

 proved. 



The following program was then offered : 



M. A. Bigelow, Embryology of Lepas. 



F. E. Lloyd, The Genus Lycopodium in North America. 



Summary of Papers. 



Mr. Bigelow's paper was based upon the results of an inves- 

 tigation recently completed, which was undertaken with the 

 view to applying the cell-lineage method in an accurate study 

 of the cleavage and the formation of the germlayers in Lepas 

 and other Cirripedes. 



Four species have been studied, but the only complete series 

 of embryonic stages was obtained from Lepas anatifera. 



