122 GKOGHAPMY OF AMMAI^ IN SOimi OKVON. 



vast shoals, in quest of bait, and some are solitary 

 in their migration, bent on the pursuit of shoals, or 

 of rambhng individuals. There is also, in this class 

 of animals, much to be observed of the stragoling^ 

 or irregular migration, although, possibly, observa- 

 tions on lishes hare not been numerous enough to 

 warrant this assertion : but it does seem as if there 

 was a deal of uncertainty in the movements of many 

 of them, and on what this may depend I cannot 

 even suggest Of internal migrations, as a conse- 

 quence of want of food, we have many examples ; 

 and it deserves notice that these are of two kinds, — 

 first, that which occurs annually or in%-anablv, and 

 that w hich is determined by severity of weatlier or 

 other causes depriving animals unexpectedly of their 

 ordinary supply. Under the latter kind we may 

 place some partial mio^rations, and some uncertain 

 and straggling migrations among our own animals ; 

 at least, in the absence of a better reason, it may be 

 j^lausible to ascribe them to this cause. 



We have now to consider the last circumstance 

 influencing the extent, variety, and geography of our 

 fistuna ; namelv, the hostility of roan to certain species 

 and tribes, f have placed this separately from the 

 other conditions, wnen I first alluded to it consi- 

 dering that it was more a moral than a physical in- 

 fluence. The agricultural improvements, cultiva- 

 tion, and planting of the land, are indeed equally 

 the results of human industry and art ; but these 

 may now be considered as ingredients, as " part and 

 j^rcel" in the characteristic features of the county, 

 and, as we have just stated, are always included m 

 an account of the natural history of any animal 

 which may happen to be at all connected with them ; 

 tliey are spoken of indeed quite in the same way as it 

 is usual to allude to any natural product, or any 

 aboriginal circumstance or condition; whilst the 

 p^e^ent influence is far from being a necessary con- 

 semience of the civilization of man, or of the coIodi- 

 zation of a country ; it seems rather to be the result 



