RECORDS 513 



black paper and allowed to remain a week or more, affected the 

 plate in the same manner as light, the part affected developing 

 black. He verified this effect by a number of experiments. In 

 the author's opinion, this effect seemed likely to be caused by 

 true Becquerel rays, as it passed through the black paper which 

 is perfectly opaque to ordinary light. 



^ William S. Day, 



Secretcwy. 



SECTION OF BIOLOGY. 

 December to, 1900. 



Section met at 8:15 p. m., Professor C. L. Bristol presiding. 



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

 proved. 



Professor Lloyd offered his resignation as Secretary of the 

 Section, because he is soon to leave for Europe on a leave of 

 absence from Teachers College. On the motion of Professor 

 Wilson, seconded by Dr. Calkins, a vote of thanks was tendered 

 to the secretary for his interest in furthering the work of the 

 Section. 



The following program was then offered : 



G. N. Calkins, Some Interesting Protozoa from Van Cort- 

 LANDT Park. 



H. E. Crampton, Elimi^v^atign in Lepidoptera. 



E. B. Wilson, The Chemical Fertilization of Sea-Urchin 

 Eggs. 



Summary of Papers. 



Four genera of Protozoa which are usually regarded as inter- 

 mediate forms between the classes of Protozoa were considered. 

 These were : Niiclcaria, intermediate between the Rhizopoda 

 and the Heliozoa ; Mastigomccba^ intermediate between Masti- 

 gophora and the Rhizopoda ; Miilticilia, intermediate between 

 the Mastigophora and Ciliata, and Actiiwbolus, intermediate be- 

 tween the Ciliata and the Suctoria. The method of feeding in 

 the latter form was also described for the first time. All of these 



