1216 77/r /'Yom of th< <.'<nnln'f</t/r Dixfrirf 



which exists between the dry Germanics and their associates. 

 Tin 1 former are one of a great association which depends upon 

 subdued light, and moisture, but they are not the specialised 

 members of that association as are the dry Germanic 

 theirs. In this again they differ from the fen plants, which 

 agree with the dry Germanics. 



To sum up then, we have in the Germanic flora three 

 groups water, wood and dry soil plants. The first and la>i 

 of these with species of wider distribution combine to form 

 associations of which they are the most specialised members. 

 The second, the wood Germanics, restricted in their distri- 

 bution owing to various causes, form but a portion of a wood 

 association. 



PART II. 



If the map at the commencement of this paper be referred 

 to, it will be seen that the Cambridge district has been 

 divided into areas coloured to represent the different plant 

 associations. 



1. The fens indicated in light blue. 



2. An area coloured pink, yellow and brown, a xerophytic 

 flora. 



3. Meadow lands, blue, following the course of the rivers, 

 a grass association. 



4. A green portion to the south-east of Cambridge with 

 an outlier to the west. This may be called tin 1 shade 

 association. Where the country is wild this has been in- 

 dicated by an intenser shade, in the case of the fens bright 

 blue and of the upland flora bright pink. 



It will be noticed that the floral areas numbered 1, 2, 

 and 4, have already been touched upon in the first portion of 

 the paper, the third, the meadow association, has no Germanic 

 representatives and so has hitherto not been referred to. 



Before commencing the descriptions of the association, it 

 is necessary to point out, with regard to this map, that owing 



