PIN US SYLVESTRIS. 133 



number of branches and the relative vigor of terminal 

 and lateral*shoots. Compare also, as to size, the buds 

 found in clusters at the apices of the branches. 



The arrangement of the dwarf branches. Select the 

 straightest and most vigorous year-old branches for 

 this study. Notice 



a. The position of the branches relative to the scales. 

 It. Their absence from certain portions of the stem. 



c. Pull out the pairs of leaves from fifteen or twenty 

 consecutive branches. Stick a pin at the base of 

 any branch, and then find a branch that stands 

 directly above this one. Count the number of 

 branches between these, including the first. This 

 number will be equal to the number of vertical 

 ranks in which the branches stand. 



d. Make a diagram in the following manner, to show 

 the relative position of the branches : draw lightly 

 a number of concentric circles about three milli- 

 meters apart (the number should be twice as 

 many as the number of vertical ranks, plus one). 

 Divide the outer circle by as many equidistant 

 points as there are vertical ranks of branches. 

 From these points draw radii, lightly. Take a 

 piece of straight stem about ten centimeters long 

 which has been stripped of its leaves. Mark the 

 position of three or four consecutive branches by 

 pins, so placed that if pressed in they would pass 

 through the center of the stem. Fasten the lowest 

 pin securely. Make a mark on the outer circle at 

 any radius to indicate the position of the branch 

 marked by the lowest pin. Erect the stem at 

 the center of the circles, making the lowest pin 

 coincide with this radius, and mark the next 



