256 Analj/tical Notices of Boohs, 



naturalists as do not coincide with his own observations. These 

 details, however, we must pass over, and proceed to give a brief 

 outline of another Anatomical Paper of groat interest, and which 

 we lament tliat our limits preclude us from noticing more at 

 length. 



This article is entitled, " Uber die Eiitwickelung der Eier 

 im Eierstock bei den Gespentheuschrecken, und eine neuent- 

 deckte verbindung des Riickengefasscs mit den Eierstiicken 

 bei den Insecten," by Dr. Johannes Miiller ; a title, which al- 

 though tolerably comprehensive, is by no means adequate to the 

 vast field of investigation into which the learned authour has 

 entered, and which he has cultivated with a degree of z*al, per- 

 severance, and success, highly creditable to his talents. Instead 

 of confining himself to the mere anatomical demonstration of the 

 communication which he has discovered between the dorsal 

 vessel of insects and their ovaries, and of simply pointing out the 

 various changes wiiicli take place in the latter and in their 'con- 

 tents during the development of the eggs, he launches out into 

 a most extensive physiological enquiry into all the leading facts 

 connected with the circulation, growth, and reproduction of 

 insects, and throws no inconsiderable light upon all these sub- 

 jects, which in spite of the patient and laborious researches of 

 many able naturalists, from Swammerdam and Leeuwenhoek to 

 Marcel de Serres and Herold, still remain involved in obscurity. 

 The simple fact, indeed, of the existence of a pervious connexion 

 between the ovaries and the dorsal vessel, which latter had 

 hitherto been regarded as a mere tube, entirely destitute of 

 ramifications, and possessing no direct means of communication 

 with any other organ, is so important in every point of view, and 

 disturbs all previous theories on the subject to such a degree, 

 that its discovery can hardly fail to operate a complete revolution 

 in the ideas hereafter to be entertained with regard to the ofiice 

 of that vessel, and its influence on the animal economy. 



In order to convey to our readers some notion, however im- 

 perfect, of the value of the facts which are developed in this 

 important paper, we shall confine ourselves to a faint outline of 

 the minute description given by its authour of this appendage to 



