PART I 



Studies of Twigs and Buds 



I. THE BUD AND THE BRANCH 



1, A twig cut from an apple tree in early 

 spring is shown in Fig. 1. The most hasty ob- 

 servation shows that it has various parts or mem- 

 bers. It seems to be divided at the point / into 

 two parts. It is evident that the portion from / 

 to h grew last year, and that the portion below 

 / grew two years ago. The buds upon the two 

 parts are very unlike, and these differences chal- 

 lenge investigation. 



2. In order to understand this seemingly life- 

 less twig, it will be necessary to see it as it 

 looked late last summer (and this condition is 

 shown in Fig. 2). The portion from / to h, — 

 which has just completed its growth, — is seen to 

 have only one leaf in a place. In every axil (or 

 angle which the leaf makes when it joins the 

 shoot) is a bud. The leaf starts first, and as 

 the season advances the bud forms in its axil. 



(1) 



