288 OBSERVATIONS ON 



It has been the received opinion that 

 trees grow in height only by their annual 

 upper shoot. But my neighbour over the 

 way, whose occupation confines him to one 

 spot, assures me that trees are expanded 

 and raised in the lower parts also. The 

 reason that he gives is this : the point of 

 one of my firs began for the first time to 

 peer over an opposite roof at the begin- 

 ning of Summer ; but before the growing- 

 season was over, the whole shoot of the 

 year, and three or four joints of the body 

 beside, became visible to him as he sits on 

 his form in his shop. According to this 

 supposition, a tree may advance in height 

 considerably, though the Summer shoot 

 should be destroyed every year. White. 



FLOWING OF SAP. 



If the bough of a vine is cut late in the 

 Spring, just before the shoots push out, it 

 will bleed considerably ; but after the leaf 

 is out, any part may be taken off without 



