SIZE OF ANIMALS. 71 



tures, the Eagles, the Falcons, the Owls, the Swallows, 

 the Finches, the Warblers, the Humming Birds, the Doves, 

 the Wrens, the Ostriches, the Herons, the Plovers, the 

 Gulls, the Ducks, the Pelicans ; among Reptiles, the Cro- 

 codiles, the different families of Cheloniaus, of Lizards, of 

 Snakes, the Frogs proper, the Toads, etc. ; among Fishes, 

 the Sharks and Skates, the Herrings, the Codfishes, the 

 Cyprinnodonts, the Chsetodonts, the Lophobranches, the 

 Ostracionts, etc. ; among Insects, the Sphingoidse or the 

 Tineiua, the Longicorns or the Coccinellina, the Bom- 

 boidse or the Brachonidse ; among Crustacea, the Can- 

 croidea or the Pinnitheroidse, the Limuloidre or the 

 Cypridoidse, and the Rotifera ; l among Worms, the Dor- 

 sibranchiata or the Naioidse ; among Mollusks, the Stroni- 

 boidse or the Buccinoidse, the Helicinoidae or the Lim- 

 nseoidse, the Chamacea or the Cycladoidce ; among Radiata, 

 the Asterioidse and the Ophiuroidse, the Hydroids and the 

 Discophorse, the Astrseoidse and the Actiiiioidae. 



Having thus recalled some facts which go to show what 

 are the limits within which size and structure are more 

 directly connected, 2 it is natural to infer, that, since size 

 is such an important character of species, and extends 

 distinctly its cycle of relationship to the families or even 

 further, it can as little be supposed to be determined by 



1 See DANA'S Crustacea, p. 1409 the least bearing upon the question 



and 1411. of origin, or even the maintenance of 



- These remarks about the average any species, but only upon the con- 

 size of animals in relation to their dition of individuals, respecting which 

 structure, cannot fail to meet with more will be found in Sect. 16. More- 

 some objections, as it is well known over, it should not be overlooked that 

 that, under certain circumstances, there are limits to these variations, 

 man may modify the normal size of and that, though animals and plants 

 a variety of plants and of domesti- may be placed under influences con- 

 cated animals, and that, even in their ducive to a more or less voluminous 

 natural state, occasional instances of growth, yet it is chiefly under the 

 extraordinary sizes occur. But this agency of man that such changes 

 neither modifies the characteristic reach their extremes. (See also Sect. 

 average, nor is it a case which has 15.) 



