Digest of Current Literature. 163 



and Sons, Verick, all received gold medals. The Bausch & Lomb Op- 

 tical Company, Crouch, Pillischer, Plossel & Co., Swift, and Joseph 

 Zentmayer, silver medals. 



Lymphatic Hearts. — Prof. L. Ranvier. — Action of poisons and 

 resume of the subject. Among other results arrived at are the follow- 

 ing : 



1. The lymphatic hearts constitute simple organs, composed of a 

 contractile vescicle, in which no distinct parts can be admitted com- 

 parable .to auricles and ventricles. 



2. They present variable interior characters. 



3. They belong to the lymphatic sj'stem, and not to the venous 

 system. 



4. Their musular fibers are striated, but they differ from those of 

 the heart. 



The subject is not yet completed. 



Angular Aperture of Objectives. — Dr. Geo. E. Blackham. — 

 Memoir read before the Buffalo Microscopical Club. 



Studies on Foreign Microscopes. — Dr. J. Pelletan. — Continued. 

 A full description of Bulloch's " Congress " stand is given, illustrated by 

 full page engravings. 



Objectifs a Liquide Interpose. — This is the heading of an article 

 describing Gundlach's new glycerin objectives, made by the Bausch & 

 Lomb Company. 



The New \ Oil-of-Cedar Immersion of Carl Zeiss. — Dr. Henri 

 Van Heurck. 



THE AMERICAN JOURNAL OF MICROSCOPY. 



October, 1878. 



This number opens with an article on VoLVOX Globator, illustra- 

 ted, taken from Popular Science Review A translation entitled " Prof. 

 Abbe on the Defining and Resolving Powers of the Microscope is 

 given, and Mr. John Michels states the results of his examinations of 

 Oleomagarine Butteer. We will not review this subject here, as it 

 will be more fully treated in these pages in future. The Hard Tissues 

 of Animals — Their Origin and Formation isthetitleof apaperread 

 before the San Francisco Microscopical Society by Mr. Xenos Clark. 

 {November, 1878.) 



The Germ Theory of Disease, and its Present Bearing upon 

 Public and Personal Hygiene. — Prof. Jos. G. Richardson. Hyal- 

 odiscus Subtilis and H. Californicus, by F. Kitton, with some 

 additional remarks by Prof. H. L. Smith. Notes on Microscopic 

 Life in the Buffalo Water Supply, by D. S. Kellicott. The 

 Woodward Prism is discussed by J. D. C, and there are two articles 

 on Zeiss's Oil-Immersion Objectives ; one from the English i^^- 

 d7ifl«zV-, describing the 1-12 inch, the other from the October number 

 of this journal. 



