August 14, 1891.J 



SCIENCE. 



97 



glasses, the grinding of lenses for telescopes, the blowing and 

 graduating of thermometer-tubes, the making of hydrometers, 

 etc. ; and the question " Can we always count upon the Sun?" is 

 asked, though not in any sensational manner, by Mr. Gan-ett P. 

 Serviss. The sun-spot period now approaching its maximum makes 

 this query very timely. 



— Henry Carey Baird & Co. have just issued a complete treatise 

 on " The Electro-Deposition of Metals," translated from the Ger- 

 man of Dr. George Langbein, with additions by William T. 

 Brannt, editor of "The Techno-Chemical Receipt- Book." 



^The " Manual of the Paleontology of the Cincinnati Group," 

 by Joseph F. James, Part 1 (Journal Cincinnati Society Natural 

 History, April, 1891, issued July, 1891), is part one of what is 

 designed to be a manual of the fossils of lower Silurian age in the 

 vicinity of Cincinnati. The necessity of some such work as this 

 will be better understood when the fact is I'ecalled that the five or 



six hundred species of fossils known from the locality are de- 

 scribed in many dififerent publications, such as State surveys, re- 

 ports of societies, and scientific journals, extending over many 

 years. The reports of the Ohio and New York surveys contain 

 many, but by no means all, of the species. If the plan of the 

 present pubhcation be carried out, it will include descriptions of 

 all genera and species recorded from the Cincinnati formation. 

 The present, the first part, treats of Plantce and Protozoa. The 

 author does not believe the so-called marine plants described from 

 the formation are really such, but refers them to inorganic causes, 

 markings of organisms, annelid trails, etc. Two species of Hetero- 

 phyta (Cryptogamia) are described, one of which, however, is con- 

 sidered problematical. The Protozoa include two orders, Fora- 

 minifera and Spongida. Of the first one genus and two species 

 are described, and of the second fourteen genera and nineteen spe- 

 cies. Two new species, Rhombodictyon globosus and Cyathophyeus 

 siluriana, are described and illustrated. 



Ediausim 



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