366 ZOOLOGY AND ANATOMY. 



the gramineous plants, and lichens. These regions form 

 the natural divisions of the vegetable empire; and as 

 perpetual snow is found in each climate at a determinate 

 height, so, in like manner, the febrifuge species of the 

 quinquina (cinchona) have their fixed limits, which I 

 have marked in the botanical chart belonging to this 

 essay. 



" Y. Observations on Zoology and Comparative Anatomy. 

 I have comprised in this work the history of the condor; 

 experiments on the electrical action of the gymnotus ; a 

 treatise on the larynx of the crocodiles, the quadrumani, 

 and birds of the tropics ; the description of several new 

 species of reptiles, fishes, birds, monkeys, and other 

 marAmalia but little known. M. Cuvier has enriched 

 this work with a very comprehensive treatise on the 

 axolotl of the lake of Mexico, and on the genera of the 

 Protei. That naturalist has also recognised two new 

 species of mastodons and an elephant among the fossil 

 bones of quadrupeds which we brought from North and 

 South America. For the description of the insects col- 

 lected by M. Bonpland we are indebted to M. Latreille, 

 whose labours have so much contributed to the progress 

 of entomology in our times. The second volume of this 

 work contains figures of the Mexican, Peruvian, and 

 Aturian skulls, which we have deposited in the Museum 

 of Natural History at Paris, and respecting which 

 Blumenbach has published observations in the ' Decas 

 quinta Craniorum diversarum gentium.' 



" YI. Political essay on the hiiigdom of New Spain,. witJi 

 a physical and geographical Atlas, founded on astronomical 

 observations and trigonometrical and barometrical measure- 

 ments. This work, based on numerous official memoirs, 



