13S Notices respecting New Books. 



" S. That in general, when the gizzard is scaly, the internal 

 membrane of the stomach cannot be classed with the three kinds 

 of tunics which enter into the structure of the intestinal canal 

 of insects, this membrane then approaching the nature of the 

 fibrous membranes. 



*' 9. That the gizzard being simply muscular, /. e. deprived of 

 the scaly or coriaceous membrane, the internal tunic of the 

 stomach is always mucous." 



The author observes in the last place, that the presence of the 

 biliary vessels, and of the gizzard, is in proportion to the organs 

 of manducation, or to the quantity aad description of food. 

 Thus, the relation which exists between the organs of manduca- 

 tion and the digestive apparatus, seems to prove that, in the 

 classification of insects, we ought not to pay much attention to 

 the organs of the mouth, except in those insects which operate 

 a veal mastication of their food. This observation is the more 

 important, because it may lead to a more natural classification 

 of insects; an order of animals whose organization is peculiar, 

 and in which analogy, wiiich directs us in the study of the higher 

 classes of animals, can be of little use to us. 



The drawings witi\ which the work is illustrated do great 

 credit to the skill of M. de Serres, and tend greatly to elucidate 

 his subject. Phj siologifets, and those who prosecute the study of 

 general anatomy, will find this work a valuable assistant in their 

 pursuits. 



BilUothcca Spencer iana. 



Every collector of rare books is more or less acquainted with 

 the bibliographical labours of Mr. Dii)din. His publications, 

 like the works on which he treats, are objects to be coveted, 

 and hardly appear before thev are out of print. His last and 

 most splendid work, Bihliof.hcca Spenceriana, in three volumes*, 

 large imperial octavo, published at eight guineas, has risen to 

 fiixteen or twenty, and will soon be unattainable at any price. 

 The object of the work is to make the pulilic acquainted with 

 some of the principal treasures of Earl Spencer's library, the 

 richest private collection in Europe; and is exclusively confined 

 to an account of hooks printed in the fftecnlk cenlxirij, and to 

 some of the more vvi^oxfawX. first editions in the sixteenth cen- 

 tury. The author remarks in his preface, that " such a work, 

 if executed with copiousness and precision, cannot fail to be in- 

 teresting to the bibliographer, to the scholar, and to the lover 

 of ancient literature and the fine arts." It is but justice to 



* A fouitb volume is in the press. 



say 



