Amphicarpaa monoica. 



the microscope appears as a shriveled husk. Upon the 

 addition of water it becomes slightly granular, and swells 

 immediately. Differentiation into exospore and eiulo>pore 

 is noticeable now, and a small quantity of oil is seen. The 

 size of the pollen grain will be discussed later on by study 

 of a comparative series. 



The inonocarpellarv />/>/// arises from a slender gynophore. 

 The ovary is free, superior, unilocular, and contains from two 

 to four ovules. The style in a mature state is exceedingly 

 long, the stigma small, capitate, and quite 'hairy. Micro- 

 scopic examination reveals the presence of beautiful tufts 

 of hairs surrounding the base of a rounded surface, smooth 

 and having a rather sharp contour; this is evidently the 

 stigmatic area. The hairs project outwards and upwards. 

 The margins of the ovary are clothed with long unicellular 

 hairs, also small bladder hairs. The latter are numerous 

 upon the style. Stomata are present upon both style and 

 ovary. 



Extending around the carpel and passing up both dorsal 

 and ventral sutures onward into the style are strongly 

 marked bundles. Their behavior with reagents, when the 

 carpel is entire or sectioned, leads to the conclusion that 

 tannin canals are located here. 



Histological study has also demonstrated the nature of 

 "the sheath at the base of ovary " mentioned by various 

 authors. It is without doubt a nectary. A transverse sec- 

 tion of this is seen in Plate XXVIII., Fig. i, to possess ten 

 vascular bundles. The upper portion, not figured here, 

 possesses numerous pits or cells of glandular appearance, 

 which are particularly noticeable around the free margin 

 of the structure. 



In a young bud, the style is short, hooked, and the 

 stigma though capitate, shows an undeveloped condition of 

 the hairs, which are as yet closely appressed. For some 

 time after, while the style is elongating, the bent appear- 

 ance is retained, and thus the stigma inclines downward. 

 Finally the style straightens and also the stigma, the brush 



