128 



Proceedings of the Roi/al Irish Academy. 



the fifth map required to complete the projected survey is stated 

 to be in progress (13). 



In England considerable areas in the north of the country have been 

 botanically surveyed. Wm. G. Smith and Moss published a paper, 

 with a map, on the distribution of the vegetation in the Leeds and 

 Halifax district of Yorkshire in 1903 (14); and later in the same 

 year ^\^m. G. Smith and Rankin described and mapped the vegetation 

 of the Harrogate and Skipton district (15) of the same county. In 

 the following year Lewis (16) published two papers and maps on the 

 distribution of vegetation of the basins of the rivers Eden, Tees, Wear, 

 and Tyne. 



In these maps the different areas occupied by the associations are 

 marked in colours. In E. Smith's map of the Edinburgh district twelve 

 such colours are used ; in that of Korthern Perthshire, seventeen ; 

 in Fife, fourteen ; and in Eorfar, seventeen types of vegetation are 

 represented. In Yorkshire, Wm. G. Smith dilferentiates sixteen types ; 

 and Lewis's maps record nineteen and twenty-one types, respectively. 

 The scale in the case of the Scotch and Yorkshire maps is that of two 

 miles to the inch; in Lewis's maps one mile to the inch. These scales, 

 however, represent only those chosen for publication, the actual field- 

 mapping being done on the Ordnance Survey maps of one inch to the 

 mile, or on those of six inches to the mile. These coloured maps, and 

 the explanatory texts published with them, form a very valuable 

 addition to our knowledge of the vegetation of the districts concerned. 

 In addition to tlie foregoing, a beginning has been made in work of this 

 kind in the neighbourhood of Cambridge. Part II. of a paper on the 

 flora of the Cambridge district by AVallis (17), prepared in view of 

 the visit of the British Association for the Advancement of Science to 

 Cambridge in the summer of 1904, is occupied with an account of 

 the plant associations found in the district ; and a coloured map on a 

 small scale (the exact scale is not stated) is appended, in which eight 

 types of vegetation are included. 



For comparatively large areas, probably the largest scale on 

 which it will be found practicable to publish a vegetation map will 

 be that of one inch to the mile. This being so, many of the smaller 

 plant associations, which can be easily recognised in the held and 

 surveyed on a map of a larger scale, must, on account of their small 

 area, be necessarily omitted from the map. For limited areas, 

 however, maps on a larger scale may be published ; and this has been 

 done by Gaut(18) in his detailed study on the botanical survey of 

 a pasture. Woodhead (19), too, in a paper read before Section K of 



