372 



TRANSLATIONS AND SELECTED ARTICLES. 



in the san^3 class with others representing the highest development 

 consistent with the type. The first comparison of a Mygale or a 

 Scorpion with a Mite or a Tardigrade, would hardly suggest any 

 affinity ; but further study brings us acquainted with common charac- 

 ters, and leads us to view them as parts of a series in which amidst 

 the greatest variety of development an uniform type of structure is 

 observable. 



The systematic history of the several tribes occupies about half the 

 volume, and is invaluable to the practical microscopist, especially when 

 it is considered that the descriptions of the objects are aided by forty 

 closely filled plates, each containing on an average not less than fifty- 

 five subjects beautifully engraved. Such a collection of minute 

 organisms admirably represented, as many times the cost of this work 

 would not enable us to obtain elsewhere. W. H, 



TRANSLATIONS AND SELECTED ARTICLES. 



EXPERIMENTS ON THE MIGRATION OF ENTOZOA. 



BY MM. A. POUCHET AND VERRIER. 



(Translated from the Comptes Rendus of May, 1862.) 



Many of our readers are acquainted with the modern views re- 

 specting the transformations of Entozoa, as taught by Van Beneden, 

 Von Siebold, Ktichenmeister, &c. The recent researches of two 

 eminent French naturalists, MM. Pouchet and Verrier, creating some 

 doubts on the subject, we copy a translation from the Comptes Bendus 

 for May, 1862, giving an account of their experiments; and as we 

 find that Van Beneden has replied, and these writers have attempted 

 further to justify their views in the same publication, we shall con- 

 tinue the subject as the materials come to hand : — 



"In a work published by one of us in 1859, a close comparative 

 examination was made of the doctrines of those observers, who in 

 Germany and Belgium had occupied themselves with the subject of 



