1892.] 



THE MICROSCOPE. 



yl5 



C°RRESP°l1DEnCC • 



mm^m^sm^m. 



^w 



Amphipleura pellucida. — Mr. C. E. Barr, of Albion, Mich., 

 writes : 



" I was much astonished at the letter written you some time 

 ago by ' Amateur,' regarding his resolution of Amphipleura /^//2^- 

 cida. I am very sure that the key to the problem is that the dia- 

 tom was A. Lindheimerri. I know that Dr. A. Y. Moore, a short 

 time before his death, mounted a number of slides of this species 

 in the bromo-sulphide of arsenic compound, which is undoubt- 

 edly the one your correspondent refers to. 



" Dr. Moore gave me one of the slides himself, and it is easily 

 within the reach of a good objective of 1 1 ^o or i3oo (dry) ap- 

 erture." 



Cole's Series. — In answer to a query in the April Micro- 

 scope the following has been received : 



" I note the repeated inquiries in the Microscope regarding the 

 • Cole Series.' I procured a set a few years ago from W. P. 

 Collins, 157 Great Portland St., London, England. 



L. M. DeLamater. 



PVBLI CAT IONS 



Living- Matter : Its Cycle of Grozvth and Declifie in Animal 

 Organisms. By C. A. Stephens. i6mo., pp. 107. Norway 

 •Lake : The Laboratory Co. 



This little volume is, as the author says, a resume of an ex- 

 tended investigation into the causes of old age and organic death, 

 especially of the human being. The subject is treated as a phil- 



