208 EVOLUTION, OLD AND NEW. 



out from it. Fifthly, by the inoculation or engrafting 

 of trees many fruits are produced from one stem. 

 Sixthly, a new tree is produced from a branch plucked 

 from an old one and set in the ground. Whence it 

 appears that the buds of deciduous trees are so many 

 annual plants, that the bark is a contexture of the 

 roots of each individual bud, and that the internal wood 

 is of no other use but to support them in the air, and 

 that thus they resemble the animal world in their 

 individuality. 



" The irritability of plants, like that of animals, appears 

 liable to be increased or decreased by habit ; for those 

 trees or shrubs which are brought from a colder climate 

 to a warmer, put out their leaves and blossoms a fort- 

 night sooner than the indigenous ones. 



" Professor Kalm, in his travels in New York, observes 

 that the apple trees brought from England blossom a 

 fortnight sooner than the native ones. In our country, 

 the shrubs that are brought a degree or two from the 

 north are observed to flourish better than those which 

 come from the south. The Siberian barley and cabbage 

 are said to grow larger in this climate than the similar 

 more southern vegetables ; and our hoards of roots, as 

 of potatoes and onions, germinate with less heat in spring, 

 after they have been accustomed to the winter's cold, 

 than in autumn, after the summer's heat. 



" II. The stamens and pistils of flowers show evident 

 marks of sensibility, not only from many of the stamens 

 and some pistils approaching towards each other at the 

 season of impregnation, but from many of them closing 

 their petals and calyxes during the cold part of the 



