94 JOURNAL OF THE [April, 



Dr. H. Hensoldt remarked upon the subject of the Fora- 

 minifera, reviewing the interesting geological side of the sub- 

 ject. 



Mr. Hyatt said of his exhibit that it was collected on the 

 23d of November last, from a brook in Dutchess County, 

 N. Y., where it suddenly appeared, and increased so rapidly 

 as to cover the stones, etc., on the bed of the stream to the 

 thickness of more than one-quarter of an inch. And, further, 

 that the only published locality for this rare diatom is Lake 

 Erie. 



Meeting of January 2D, 1891. 



The President, Mr. P. H. Dudley, in the chair. 

 . Thirty-five persons present. 



The Committee on Nominations of Ofificers, appointed at the 

 meeting of November 21st, 1890, reported their nominations of 

 the persons who were unanimously elected, as is stated below. 



The President appointed as tellers of the election of officers 

 the Rev. George C. F. Haas and Mr. Horace W. Calef. 



Mr. Charles F. Cox read the following papers, as announced 

 ■on the programme of the evening : 



1. "On the Structure of the Pleurosigma Valve"; by T. F. 

 Smith, Esq., F.R. M.S., of London, England. This paper, pub- 

 lished in the present number of the Journal, p. 61, was illus- 

 trated by lantern projections of fifty excellent lantern slides, from 

 original photomicrographs, and by numerous other mounted 

 photomicrographs, by Mr. Smith. 



2. " Diatom-Structure — The Interpretation of Microscopical 

 Images"; by Jacob D. Cox, LL.D , F.R.M.S., of Cincinnati, 

 Ohio 



This second paper, published in the present number of the 

 Journal, p. 73, was illustrated by one hundred photomicro- 

 graphs, twelve of which were by the late Col. J. G. Woodward. 



Mr. Charles F. Cox announced the donation to the Society by 

 Mr. T. F. Smith of the fifty lantern slides just exhibited. 



On motion it was resolved that the thanks of the Society be 

 hereby tendered Mr. T. F. Smith for his interesting and valuable 

 paper, " On the Structure of the Pleurosigma Valve,'" and for his 



