12 JOURNAL OF THE [January, 



natural size. Last summer Dr. Wilson repeated this experiment 

 in the case of Amphioxiis. If the two cells are simply disturbed 

 the result will be two embryos; and so, in the four-cell stage, the 

 result will be four embryos, showing an original connection be- 

 tween the cells. 



Meeting of October 2ist, 1892. 



The Vice-President, Mr. Charles S. Shultz, in the chair. 



Forty persons present. 



Mr. William Wales was elected Recording Secretary//-^ tern. 



The Corresponding Secretary presented a communication from 

 Mr. K. M. Cunningham, accompanying a donation to the Cabi- 

 net of two slides of diatoms, and dated Houston, Texas, Octo- 

 ber i2th, 1892, as follows : 



" Notes explanatory of two slides of diatoms : 



" I. Slide of Terpsinoe musica Ehrbg. On the occasion of a 

 visit to San Antonio, Texas, in the spring of 1887, I secured a 

 specimen of a filamentous alga from the fresh water, flushing 

 ditches permeating the streets of San Antonio. Without know- 

 ing what I had secured, I forwarded the material to Mr. C. L. 

 Peticolas, who returned me beautifully prepared slides of T. musica, 

 and at the same time solicited a larger quantity of the material. 

 I found it impossible to secure any one who could procure addi- 

 tional material from the same locality. But recently, in August, 

 1892, while on an excursion to San Antonio, 1 visited the San 

 Pedro Springs and tested for the presence of T. musica. I 

 promptly verified the fact that it grew in the greatest abundance 

 on the water plants choking up the shallow waters of the minia- 

 ture lake. I secured a rake and landed a mass of Myriophyllum, 

 which I allowed to dry in the sun. This I took to Houston, and 

 in a month or more found leisure to make a reduction for the dia- 

 toms therein. 



" A little acquaintance with the diatoms occurring in this fresh- 

 water lake enables me to tabulate the following species, which 

 may be seen on the slide sent herewith : Biddulphia Icevis, Cytn- 

 bella gastroides, C. affinis, Cocconeis scutellum, Gomphonema capita- 

 turn, Cymatopleura elliptica, Melosira crenulata, Navicula nobilis 

 and others, Nitzschia panduriforjiiis, Synedra ulna, several species 



