250 



G. T. HARRIS ON THE 



and Saddle Tor. Generally speaking, the bogs in this district 

 are of small extent, but the yield in species is remarkably good. 

 Here again the bogs are of an average altitude of from 1,200 to 

 1,300 feet. 



V. PosTBRiDGE. — This, the southern limit of my collecting 

 district, joins No. 1 (Metherall) at Water Hill in the north and 

 extends to Believer Tor in the south. On the east it is bounded 

 by the huge rampart of Hamel Down, while Higher White, Lower 

 White and Longford Tors mark its western extension. At Cut 

 Hill, practically the centre of Dartmoor, the Postbridge district 

 joins districts I and III. The district is drained by the East 

 and West Dart and the small streams Cherrybrook, Lade and 

 the southern Wallabrook. At least two important bogs occur in 

 this district, Merripit and Broad Down, while another, Sousson's 

 Bottom, though of less extent has proved an excellent collecting 

 station. The whole district is thickly studded with bogs of 

 greater or lesser extent, and from a collector's point of view ranks 

 with the Gidleigh and Metherall districts as the best on the moor. 



In district No. VI, Moor Pools, I have placed together the 

 small moor pools situated above the altitudes at which the bogs 

 occur, and which are completely isolated and not dependent for 

 their water supply on drainage surfaces. These pools are not 

 numerous on Dartmoor, and are of very small area (about thirty 

 feet diameter), nevertheless they afford good and interesting 

 collecting and I have thought it worth while to keep the results 

 separate. They are nearly all above the 1,800 feet contour 

 line and generally characterised by a profuse growth of 

 Sphagnum cuspidatum var. plumulosum. The following table 

 shows the result in species, varieties and " forms " of the various 

 districts : 



Table I. 



