1897.] NATURAL SCIENCES OF PHILADELPHIA. 165 



especially should it be found, as it is to be expected, that the growth 

 of runners from the development of underground buds is more vig- 

 orous when the chief energy of the plant is not consumed in fruit 

 formation. 



EXPLANATION OF PLATE III. 



Figs. 1, 2, 3, 4, 5, 7, and 8 young plants of Arisaema trip hy Hum, 

 £ natural size. 



Fig. 6, corm of fig. 5, showing conical shape of lower portion after 

 removal of coating ; $ natural size. 



Fig. 9, corm with two buds, z, and appendage from a plant simi- 

 lar to that represented in VIII ; h natural size. 



Fig. 10, a, b, c, d, e, f, g, conns from flowering plants showing a 

 variety of form ; h natural size. 



Fig. 11, pollen grains; the protoplasm is contracted by alcohol ; 

 the nucleus, n, is very distinct ; greatly magnified. 



Fig. 12, stigma beset with large club-shaped trichomes, three pol- 

 len grains are visible, p ; greatly magnified. 



12 



