A. FE. Verrill—The Bermuda Islands; Geology. 15d 
fact, at the times of our visits the sand was drifting but little at any 
place except near Tucker’s Town, owing to the vegetation. 
An unusually long drouth, by injuring or destroying the vegeta- 
tion, might cause the sands to drift again in many localities. It was 
also noticed that in several limited areas the drifting sand did not 
come from the beaches, but was derived from the crumbling of old 
veolian rocks. 
Peat Bogs. 
Deposits of peat of considerable extent occur in several of the 
swamps in Bermuda. The most extensive are in Devonshire Swamp 
Figure 44b.—View in Devonshire Swamp. From a photograph, after Thomson. 
and Pembroke Marsh, These swamps occupy deep valleys between 
the hills of wolian limestone and their bottoms are many feet below 
the present sea-level, so that the water in them is more or less 
brackish below the surface. Governor Lefroy is reported to have 
tested the depth of peat in Pembroke Marsh, in 1872. It is said 
that he found that it was 42 feet or more deep.* 
* See p. 87; and ‘‘ The Bermuda Islands,” p. 55. Also J. M. Jones, Visitor’s 
Guide, p. 121. For view of Pembroke Marsh, see ‘‘The Bermuda Islands,” p. 
159, cut 382. 
