638 Analytical Notices of Books. 



s'lty of these circumstances. More completely than any other 

 class of the animal creation the Mollusca are the slaves of circum- 

 stances, possessing not the power of withdrawing themselves from 

 external influences ; and if the change of food and habitation has 

 been S'ufficient to vary almost to infinity the forms of our domes- 

 tic animals, and even of our cultivated plants, ought not also the 

 difference of soil, of depth, of temperature, and of agitation in 

 the waters in which they dwell, to produce an equal extent of 

 varieties in the inhabitants of the sea? The local varieties, 

 though well known to those whose faculties have been sharp- 

 ened by interest, are yet unnoticed by the naturalist. To him 

 the common Oyster is the same, no matter on what shore it may 

 have been taken ; but to the dealer, even of moderate experience, 

 the locality from which it arrives is at once evident on mere 

 inspection. 



Entomohgische Monographien. — Entomological Monographs. 

 By Dr. Fu. Klug, Director of the Royal Zoological 

 Museum J 6^c. S^c. Berlin. 1824. 8vo. pp. 242. Coloured 

 plates X. 



To the student of Entomology the name of Professor Klug is 

 well known, not merely on account of his official situation in 

 charge of a collection of Insects which is probably the most ex- 

 tensive in the world, but also for the abilities he has displayed in 

 his repeated attempts at rendering available to the purposes of 

 science, the rich stores with the care of which he is entrusted. 

 Engaged as his time must necessarily be, in the numerous duties 

 connected with the preservation and arrangement of that im- 

 mense and continually increasing cabinet, his leisure cannot be 

 sufficient to enable him to prepare any very extensive work, and 

 he has therefore limited himself hitherto to the descriptions of 

 certain genera, or of some of the more striking insects, which he 

 has given to the world, either in a detached form, or through the 

 medium of the learned societies of Germany. His present work, 

 contains one of these monographs, with very important additions, 

 together with several othejs which have not before appeared j 



