1890.] NEW-YORK MICROSCOPICAL SOCIETY. 91 



PROCEEDINGS. 



Meeting of February 7th, 1890. 



Owing to alterations in progress at the rooms of the Society, 

 the meeting was held in the Natural History Hall of the College 

 of the City of New York. 



The Vice-President, Mr. J. D. Hyatt, in the chair. 



Forty-five persons present. 



Dr. William Stratford addressed the Society on " Methods in 

 Photomicrography." This address was illustrated by a series of 

 photomicrographic apparatus, and by a series of lantern slides 

 showing stages of nettle-cells of Physalia ; living diatoms, 

 mainly Heliopelta and Triceratia ; diatoms in stages of repro- 

 duction ; and injured frustules of diatoms. Perhaps the most 

 beautiful exhibit of the collection was a Suriella gemma, taken 

 under a Powell and Lealand ^, with oblique light from the 

 prism, in the green band of the spectrum, showing most promi- 

 nently the difficult " basket work." 



Mr. L. Riederer read a Paper, entitled : — " The Ovipositor of 

 Cry plus samicB." 



OBJECTS exhibited. 



1. Transverse section of ovipositor of the ichneumon fly, 

 Cryptus samice : by L. Riederer. 



2. A photomicrograph of Pleuroiig^na angulaluiii, X 4900, 

 recently received from Zeiss : by P. H. Dudley. 



Meeting of February 2ist, 1890. 



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



Sixteen persons present. 



President Dudley read a Paper upon the Termites of the 

 Isthmus of Panama, referring especially to the genus Calotermes. 

 The Paper was illustrated by numerous specimens of different 

 species, portions of nests, and destructive wood-borings, together 

 with microscopic slides and photographs of nests, sent by Mr. 

 J. Beaumont, of Colon, S. A. Mr. L. Riederer exhibited sec- 

 tions of Queens of Termites in connection with the above Paper. 



