30 ART. 4. — A. YASUDA : ON THE 



of the cotyledons of Momord'wa Charani'ia, Luffa cylindrica, L. 

 acidaiifjula, Citrullus vulgaris, Cucuîuis saltvus, C Melo, Tricho- 

 santhes cucunieroides, T. japonica, T. muUiloba, Cucurbita Pepo, 

 and Gymnodemma cissoides, as well as on the under surface of 

 those of Blomordica Charantia, TriGhosanthcs cucitmeroides, T. 

 japonica, T. muliilolm and Gymnodemma cissoides, the walls of 

 the epidermal cells are straight ; while they are wavy on the 

 upper surface of those of Actinosiemma racemosum, 3Ielothria 

 japonica, Benincasa cerifera and Lagenaria vulgaris, as well as 

 on the under surface of those of Actinostemnia racemosum, Melothria 

 japonica, Luffa cylindrica, L. aculangula, Citrullus vulgaris, 

 Cucumis sativus, C. 3Iclo, Benincasa cerifera, Ljagenaria vulgaris 

 and Cucurbita Pepo. 



Stomafif. In nearly all of the species, as far as we have 

 seen, stomata are found on both the upper and under surfaces of 

 the cotyledons. Exceptions are however to be found in some 

 species, where they are either almost exclusively on the upper 

 side or only on the under. For example, in 3louiordica Cliarantia, 

 Trichosanthes japonica and 2\ multiloba, they are cliiefly on the 

 upper, very rarely on the lower surface, while in Gymnostemvia. 

 cissoides they are exclusively on the lower. 



The numbers of the stomata found on the upper surface of 

 the cotyledons of each species average as follows to a square 

 millimetre : 



Citrullus vulgaris 270 



Luffa cylindrica 268 



L. acutangula 260 



Cucurbita Pepo 224 



Lagenaria vulgaris 164 



