Analytical Notices of Books. 241 



worthy of your so useful Society. Unless the Sulphur moves to some 

 other part of New Holland, I fear I shall add little to your Australian 

 Ornithology. 



Believe me, &c. &c. 



A. Collie. 



Art. XXXV. Analytical Notices of Books. 



Unter suckling en ucber die Bildung und Entwickelung des Flusskrebses: 

 von Heinrich Rathke. 3Iit 5 Kupfertafeln. Leipzig, 1829. 

 Fol pp. 97. 



Researches on the Formation and Developement of the Crawfish. 



The zoologists of this Country have been of late years so accustomed 

 to direct their attention almost exclusively to animals in their perfect state, 

 that to the greater number of our readers, the analysis of a work devoted 

 to their illustration in the earliest stages of their developement will 

 in all probability present an altogether novel subject of contemplation. 

 It is for this reason especially incumbent on us to put on record 

 some account of one of the most valuable contributions to animal physio- 

 logy that we have met with for a considerable time. Any analysis of a work, 

 chiefly remarkable for its minute details on the minutest objects, must 

 necessarily be very imperfect; but we shall endeavour, as far as possible, 

 to select its leading features, so as to give a general, if not a complete, 

 idea of its contents. 



While the comparative anatomists of France and England have been 

 for the most part content to follow in the beaten track of observation, 

 those of Germany have been exploring a new path, in which they 

 have already made discoveries of the highest importance, with the promise 

 of a much more ample harvest for the future. In common with the philoso- 



VOL. V. Q 



