210 THE BOOK OF NATURE STUDY 



moors, the exact habitat of the Bilberry ; in a common, the position 

 of the Ragwort, may be carefully recorded. Then the reason for 

 the habitat should be sought. Very often it will be found that 

 the degree of dryness or moisture is the determining factor. 



BIBLIOGRAPHY. Lloyd Praeger's Open Air Studies in Botany, Marshall 

 Ward's Grasses ; Clement's Plant Physiology and Ecology, Sir Edward Fry's 

 Mosses ; Lewis, " The Sequence of Plant Remains in the British Peat Mosses," 

 Science Progress, October 1907 ; C. E. Moss, " Peat Moors of the Pennines," Geo- 

 graphical Journal, May 1904 ; Smith and Rankin, " Geographical Distribution of 

 Vegetation in Yorkshire," Geographical Journal, April and August 1903 ; C. E. 

 Moss, Geographical Distribution of Vegetation in Somerset; Lewis, "'Geographical 

 Distribution of Vegetation of the Basins of the Rivers Eden, Tees, Wear, and 

 Tyne," Geographical Journal, March and September 1904 ; Woodhead's Ecology 

 of Woodland Plants in the Neighbourhood of Huddersfield. 



END OF VOL. IV. 



Printed by MORRISON & GIBB LIMITED, Edinburgh 



