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AMERICAN JOURNAL OF BOTANY 
[Vol. io, 
which grows upward somewhat more slowly than the wall of the carpel, 
to which it is attached at two or three points. The edges of the carpel 
become drawn together above the placenta and for a time there is an open 
Text Fig. i. Stages in the development of the flower of the potato (Beauty of 
Hebron). R, receptacle; C, calyx; P, petal; St, stamen; Carp, carpel; PI, placenta. X 80. 
canal through the style, but as the latter elongates the canal becomes closed 
with a delicate tissue of thin-walled cells. 
A transverse section of the bud (text fig! 2) shows, on the outside, the 
calyx which is continuous except near the apex of the bud. The five 
