Halsted.] 216 [May 16, 



Thus in the first, or lowest bud of branch 7 we find the 1st, 4th, 

 5th and 6th pair of leaves convolute, and the 2d and 3d imbricate, in 

 the bud. In this branch, out of the 36 pairs of leaves, 25 are convo- 

 lute and 11 imbricated. 



The next table represents simply the results obtained in examining 

 13 branches in this fashion — the number of the branch being given 

 at the left, followed by a number of convolute pairs 

 in the second column, and those that were imbri- 

 cated in the third. 

 2 30 6 



This gives the number of convolute to imbri- 

 cated buds as in the ratio of nearly 3 to 1. Up to 



5 27 9 ^ e present time this is the only generalization 



6 27 9 wn i cn can he made. 



7 25 11 ^ n *he wild cherry (Prunus serotind) each leaf is 



8 28 8 conduplicate, and on account of the phyllotaxis be- 



9 27 9 hig two-fifths, the leaves, taken in the order of 



10 24 12 their development, do not stand near each other; 



11 21 15 thus No. 1 covers 4 and 6, No. 2, 5 and 7, etc., — 



12 36 therefore giving no distinct imbrication or convo- 



13 21 15 lution. It was observed that the leaf spiral was 

 Total 345 123 either with, or opposite to, the hands of a watch, 



and as it was followed around, came first either to 



the midrib or folded edges of the leaves, giving rise to four different 



cases, as the following table will illustrate. 



Midrib ) with hands of watch 13 



first j opposite hands of watch 9 



Edges ) with hands of watch 16 



first ,( opposite hands of watch 12 



We see, out of the fifty buds examined, they were quite evenly 



distributed among the four cases. In one instance the four kinds 



were found in succession in passing up a stem. 



General Meeting. May 16, 1877. 



The President, Mr. T. T. Bouve, in the chair. Thirty-two 

 persons present. 



The following papers were read : — 



