12 



ART. 4. — A. YASUDA : ON THE 



Luffa acutangula 0.50 mm 



Lagenaria vulgaris 0.50 



Cucurbita Fepo 0.48 



Benincasa cerifera 0.48 



Luffa cylindrica 0.46 



Trichosanihes jajwnica 0.45 



Moitiordica Charantia 0.4o 



Tricliosantlics cuctwteroidcs 0.32 



Citrullus vulgaris O.ol 



Tricliosanihes multiloba 0.30 



Cucumis Melo 0.25 



(7. sativus 0.24 

 Schizopeprm bryoniccfolius, var. japotiicus 0.23 



Gymnostemma cissoides 0.22 



Actinostemma racemosuni 0.17 



Melothria japo7iica 0.14 



Periderm. In the very old stem.s of many species periderm 

 is often formed, l>ut in none is it so well developed as in 

 Tricliosanthcs cucumcroidcs, T. juponica, and T. iiiuUiloha. Tlie 

 periderm originates from phellogen, wlncli lias been formed on 

 the outside of the sclerenehvmatous sheath. 



Starch-grains and Crtjstals. Although some si)eeies contain 

 reserve starcli-grains in the full-grown stems, yet most species 

 first accumulate them in the old stems, where they are reserved 

 chiefly in the medullary rays. The stems ef Gymnostemma cis- 

 soides and Actinostemma racemosum contain reserve starch-grains 

 from a comparatively early age. 



