AND THE DISTRIBUTrON OF THE STOMATA. Ill 



stoinata on the upper surface are equal to or more iu number 

 than the lower stomata. They are 12, or 29 per cent. 



JO 



Artemisia Dracunculus -r 



41 



Urinum capense — 



DeBmoclium gyrans (about) ~ 



7*3 



DiantliiiB sp g:^ 



103 



Gjpsophila perfoliata ~ 



Lotus corniculatus 



Lathyrus sylvestris 



Medicago lupulina 



Melilotus officinalis 



Nicotiana glauca 



63 

 49 



79 



63 



118 



100 



83 



61 



JO 



9t> 



Linum flavuin -r-. Triticura sativum -— 



6-4 



86 



The Class ?^ is thus divided into 



B 



0^ 



s 



« toi 38 



38 per cent., 



S ^ 1 



Y aud over 29 „ 



or they may be arranged thus ; 



Those in which upper stomata are fewer than lower 71 per cent. 

 Those in which upper stomata are equal to or more 



numerous than tlie lower stomata 29 „ 



It is well known that succulent plants tend to be covered with 

 bloom. The following plants are excluded from comparison in 

 the matter of stomata : 



Aloe arboreseens — 



6*5 



Beschorneria Tornellii r-^ 



3 "9 



Calanthe crenata t-t 



4 d 



2*3 



Cotyledon bracteosum ^ 



Mc 



with more above than below, are also excluded, having the leaves 

 of a water-plant- It is obvious that if these leaves were included 

 in the above groups, they would favour my conclusions unfairly. 

 The three following tables give the results of the analysis of 

 the above 201 species : 



