98 JOURNAL OF THE [April, 



An accident prevented further investigation, but, from the 

 diffused condition of the nucleus, incipient reproductive phe- 

 nomena were suspected. 



In this connection I should like to draw attention to a form 

 described by me in a communication to the Academy of Natural 

 Sciences of Philadelphia, March 4th, 1884, under the name of 

 Trachelius Leidyi. The distinction then made with regard to 

 shape having been rendered invalid by the observations above 

 noted, color, and the more profuse vacuolation of the periphery, 

 alone remain, and, regarding these as insufficient differences, 

 I have decided to withdraw the species. 



PROCEEDINGS. 

 Meeting of March 6th, 1885. 



The President, Mr. C. Van Brunt, in the chair. 



Thirty-eight persons present. 



John Butler, M. D., Mr. Lucius Pitkin, Mr. Henry L. Bre- 

 voort, and Mr. Max Levy, were elected Active Members of the 

 Society. 



OBJECTS EXHIBITED. 



1. Sections of Pinus Strobus : by P. H Dudley. 



2. Head of the worker Honey-bee : by J. L. Zabriskie. 



3. Fossil leaf of Hausmaniiia : by N. L. Britton. 



4. Transverse section of leaf of Pinus pungefis : by H. W. 

 Calef. 



5. Stauroneis phcenicenteron : by E. A. Schultze. 



6. Embryonic Spiders ; mounted in glycerine : by F. \V, 

 Devoe. 



7. Cholera Bacilli : by W. H. Bates, M. D. 



8. Spores of Cholera Bacillus : by L. Sch5ney, M. D. 



9. Synapta, from Bermuda : by W. G. De Witt. 



THE cell-structure OF PINUS STROBUS. 



Mr. Dudley exhibited microscopic sections of Pinus Strobus, 

 or White Pine, and hand-specimens of three varieties of the 

 wood as determined by differences of fineness and hardness. 

 He described the cell-structure ; and he illustrated his descrip- 

 tion by photographs, and by three large wooden models which 

 represented severally a tracheide, a lenticular cavity of the thin- 



