16 ART. 4. — A. YASÜDA : ON THE 



hypocotyl may be (a) roundish, (b) roundish with a central 

 hollow, (c) square, and (d) square with a central hollow. The 

 first is found in Actinostemnia racemosum, Melothr'ia japonica, 

 Jfomordira Charantia, Luffa cylindrica, L. acutrmgula, Citrullus 

 vvlgaruy Trxcliomnihe?, cucumeroule^, T. japonica, T. multiloba, 

 and Gymnostemma cissoides ; the second, in Benincasa ccrifera, 

 Lagenaria vulgaris, and Cucurhita Pep>o ; the tliird, in Cucumis 

 sativus ; and the fourth, in Chicmim 31e] o. 



Stomata. Tlie average lunnbers of tlie stomata on the surface 

 of the hypocotyl are as follows. They are entirely wanting in the 

 species having the under-ground liypocotyls. 



Trichonies. Some species bear many tricliomes on the hypo- 

 cotyl, while others have only a small num1)er of tliem or none 



