^m 



Tlie Numerical Relations of Animals. 



long to Europe, it may be considered as a general representative 

 of the polar Fauna : 



467 



4603 



4242 



It may here be observed, that the Infusoria and Enthelmin- 

 tha are but slightly noticed : there may be in Wurtemberg 

 300 or upwards of Infusoria, and even more of Enthelmintha ; 

 the marine and other Infusoria of Greenland and Nice are not 

 mentioned ; and it is evident that the number of insects is too 

 small for the maritime Alps. 



Even more interesting than the numerical relations are those 

 connected with colour, which, however, can only be studied 

 with effect in great collections, and with the assistance of good 

 coloured drawings and engravings. On this subject, we have 

 the following, among other questions, to answer. How are the 

 colours related in the animal kingdom in general, and also in 

 the separate classes, orders, and genera ? Do we find particu- 

 lar colours predominating in certain genera, orders, &c. or are 

 they peculiar to them ? What are the relations of the dorsal 

 and abdominal colours, and latero-dorsal and latero. abdominal 

 colours ? What influence has light ? How are the colours re- 

 lated in warm and cold countries ? How are the colours in the 

 animal kingdom disposed, according to latitude and longitude, 

 and height above the level of the sea ? Has the sea, and fresh- 

 water lakes, &c. determinate influences on differences of colour ? 

 Investigations of this kind belong to general natural history, 

 and the characteristic of the animal kingdom. Unfortunately, 



