Ationst 31, 1(^1 I 7 ' 



niij^'lit he exiK'Clc'd from ils lijwci raiij^f. 'IMi is earlier l)l()(.inin«4 

 under identical conditions of environnRui, indicated that it 

 was not nierelv an elTect of external conditions upon individ- 

 uals, hut had heconie an hereditary character of the species. 



C'. i-iiisironiontamx hloonis from June to Octoher, hut the 

 individual jilanls vary much in season, as well as in size, color, 

 habit, structure of leaf, etc. A little plant found on a sunnv 

 o;ravelly hillside in the high mountains was at first taken for C. 

 laxa because of its small size (six inches), hairiness, and yellow- 

 ish cast. This form did not reappear, and it was probably only 

 a habitat form of C. austyomotitana. It is interesting to note 

 that the warm and dry conditions of this habitat produced a form 

 resembling C. laxa^ which is native to a w^arm and dry zone. 

 In more humid situations, on the other hand, are found plants 

 easily two feet in height, dark green and smooth with broad 

 leaves conspicuously three-veined. Vet these extremes are the 

 exception, and, as is so commonly the case with plants of locally 

 general distribution, the variations between one and the other 

 extreme are so multifold and constantly in evidence, that no one 

 knowing the plant in the field would make more than one spe- 

 cies of it. Havin": seen onlv the extremes in the herbarium, 

 even the most cautious systematist might feel justified in mak- 

 ing two species out of it. Hence the importance of a knowledge 

 of the plant as it grows. One dried specimen may give an idea 

 of a species, but a true concept can only be gained by seeing 

 living jjlants before you in their native habitat, and, as often 

 happens, associated with their nearest relatives in several, hun- 

 dreds, or tliousands of individuals. 

 '^- • TuiSoii. .Ari/Diia. 



AX AxciEXT kx(;lish oak 



I>v P. Bhvhridge Kexxkdv 



( With cover iiluslration ) 

 I{ngland is one of the most interesting jilaces to visit (Ui 

 account of the magnificence of her trees. This i)articular oak 

 that we luu'e been fortunate enough to photograph, makes us at 



