208 Scientific Intelligence — New Publications. 



discovery of the circulation in certain neuropterous, coleopterous, 

 dipterous, and orthopterous insects, and from the extent of 

 respiration in this class, he has placed them, along with the 

 Crustacea and Vermes, at the head of invertebrate animals, as 

 possessing a more complicated and perfect organization than the 

 mollusca. By this arrangement it follows that the Planaria, 

 the Thalassima, the Taenia, and even the Hydatis, are more 

 perfect animals than the Sepia, the Loligo, and the Octopus. 

 Although the existence of a circulation in insects does not war- 

 rant conclusions so extraordinary, it is a highly interesting fact, 

 and shews a further analogy between them and the Crustacea, 

 in which it has been long known to exist. The first volume of 

 the work is devoted to the consideration of the organs of ani- 

 mal life, including the nervous system, and the organs of sense 

 and motion, which are examined first in invertebrate animals, 

 from zoophytes to insects, and then in the four classes which 

 possess a skeleton with brain and spinal marrow. The second 

 volume treats of the organs of organic (or vegetative) life, in- 

 cluding those of digestion, respiration, secretion, circulation, and 

 reproduction, which are examined in the same order, from the 

 lowest animals upwards to the most perfect. This mode of 

 considering animals in an ascending scale, appears the most na- 

 tural, as it leads us from simple to more complex objects, it is 

 the order of their creation, as pointed out by their fossil remains, 

 by sacred testimony, and by all the phenomena of organized 

 bodies, and it is the arrangement so admirabl}^ developed in the 

 system of Lamarck. Notwithstanding occasional errors, insepa- 

 rable from a work which embraces the structure of all existing 

 animals, we consider this treatise of Professor Carus as a valu- 

 able contribution to comparative anatomy, and the translation 

 by Mr Gore, as an excellent outline of the present state of the 

 science, calculated to serve as a work of reference, and to sup- 

 ply a great desideratum in our language. 



2. Conversations on the Animal Economy. By a Physician ; 



in Two Volumes 8vo. liongman & Co. 1827. 



Mrs Marcet^s admirable Conversations on Chemistry, Na- 

 tural Philosophy, and Political Economy, are well known, and 

 much esteemed by the public. The present volumes are in imi- 



