22 ART. 4. A. YASUDA I ON THE 



Cucumis Jlelo 19 per sq. mm. 



Luffa cylindrlca 16 „ 



L. acuiangula 10 ,, 



Gucmnis saiivus 9 ,, 



CUridhcs vulgaris 4 ,, 



Some of the tricliomes are soft, while othei-s are stilf, sihcify- 

 iiig at the base centrifugally over the epidermal surface.^^ The 

 trichomes on the upper surface of the blade of Jleloihria japonica, 

 and on both surfaces of the blades of Luffa cylindrica, L. acuian- 

 gula, Ciirullus vulgaris, Cucumis saiivus and C. Jlelo, are good 

 examples of the latter kind. 



Thickness of Blades. The thickness of blades differs some- 

 wliat in each species. The average thickness of full-grown leaves 

 is as follows : 



Liffa acutangula 0.27 mm. 



L. cylindrica 0.25 ,, 



Cucumis Jlelo 0.21 ,, 



Benincasa cerifera 0.20 ,, 



Cucumis saiivus 0.20 ,, 



Jlomordica, Cliarantia 0.18 ,, 



Ciirullus vulgaris 0.18 ,, 



Trichosaiithes cucumcroidcs 0.18 ,, 



T. japonica 0.18 ,, 



J\ multiloba 0.17 „ 



Lagenaria vulgaris 0.16 ,, 



Gymnosiemma cissoides 0.16 ,, 



Aclinosiemma racemosum 0.14 ,, 



1) A. DE Eary. Cutiiparative Aniitoiny of llic rhaiieroj;aiiis and Ferns. Oxford 1884 

 p. K'îî. 



