MR. MAIN'S VEGETABLE PHYSIOLOGY. 411 



Fig. 4;. 



1831, 1830, 1829. 



" This figure shows, that the lateral shoots, d, d, d, d, and new layer of wood, b, h, 

 on the lower part of the stem of the present year, are not attached to each other ; 

 and that the growth of the former can only affect that of the latter indirectly ; nor 

 can they (the shoots, d, d, d, d, except the leading one, c,) be supposed to assist the 

 formation of the new zone of wood by ejecting fibres down into it; because their 

 fibrous attachment is upon the alburnum, as at e, e, Fig. 47 ; that is, upon that 

 division of the envelope which was formed into alburnum in the previous year. 



" The young shoots which are elongated and bear the foliage of deciduous trees, 

 are pretty regularly studded with buds along their whole length, though only a small 



