THE SHRINKING AND SWELLING SEED 195 



We there have genera, like those of Calotropis and Gossypium, 

 where the hairs may form a quarter or even nearly half the 

 weight of the seed ; and, as in one species of Gossypium named 

 in the table, the hairs may be heavier than the kernel. 



In illustration of the effect of large wing-like appendages (B) Wings, 

 on the relative weight of the seed-coats, I will take the seeds 

 of three familiar tropical plants, Swietenia Mahogani, Moringa 

 pterygosperma, and Tecoma stans, the data for which are given in 

 the following table. 



TABLE ILLUSTRATING THE EFFECT OF WINGS ON THE PROPORTIONAL 

 WEIGHT OF THE SEED-COATS IN RESTING SEEDS. 



Note. In Pinus the seed is only partially enclosed in the base of the wing, and is 

 exposed on one side. 



