1901.] 



NATURAL SCIENCES OF PHILADELPHIA. 



313 



Menispermum canadense (Moonseed). 



The leaves of two entire plants of this species were taken, the 

 leaves being numbered from the apex toward the base. In the 

 first place, the table shows the limits of variability in the adult 

 leaves of the same stem, and also contrasts the individual leaves 

 of the two plants, leaf 5 or 6 of one plant being compared with 

 leaf 5 or 6 of the other plant: 



VI. Menispermum canadense {tico plants in fresh state). 



Quercus alba (White Oak). 



The size of the nuts enclosed by the cupule in the oak varies in 

 an interesting manner. The fruits of two species of oak collected 

 by Dr. J. T. Kothrock on October 19, 1863, were studied statis- 

 tically. It is supposed that the fruits in drying preserved the same 

 relative size that they had when in the fresh, fully ripe condition. 

 The three swamp chestnut oaks from which the fruits were obtained 

 were standing close together, and each was fully three feet iu 

 diameter. Table VIII presents the measurements of the swamp 

 chestnut oak acorns, and Table VII those of the white oak : 



