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 bTtk 



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Cu. XL.] 



MIGEATION OF SPECIES. 



393 



formed the western extremity of tlie continent of Europe and 

 Northern Africa, which then extended far into the Atlantic.^ 

 But the great depth of the ocean, ranging from 1,000 to 

 10 000 feet, and often of still greater depth, which prevails over 



Slimed 



since the Miocene epocli, 

 makes me consider it far more probable that, instead of 



sunl 



been drifted from some part of America. 



may 



mention that along the northern edg 

 Hooker fomid Fums noclosus and F. s 

 all the wav from lat. 36° N. to Eng 



The hollow pod- 



many 



seem 



intended to give buoyancy. It may s 

 these hydrophytes are in general j^ 

 smallest fragment of a branch can be 



if' 



SO that the 

 I into a "oer- 



fect plant. The seeds, moreover, of the greater number 



mucous matter 



surrounds the eggs of some fish, and which not only protects 



injury, but serves to attach them 



or to rocks. 



the distrihittion of 



But we 



have as yet considered part only of the feiH^ile resources of 



nature for conveyin 

 growth. The vario 



from 



animals 



busily engaged 



im 



advantages . Sometim e s 



m to adhere firmly by prickles, 

 )f animals, or feathers of the 



hooks, and hairs to the coats of 



winged tribe, to which they remain attached for weeks, or 



even months, and are borne along into every region whither 



birds or quadr 



may migrate 



LinnsDus enumerates 



number now known 



mu 



reater, which are armed with hooks, by which, when 



r 



r 



ripe, they adhere to the coats of animals. Most 

 vegetables, he remarks, require a soil enriched with dung. 



^ E. Torbes, Fauna and Flora, &c., 1846, vol. i. p. 349. 



