576 Megalithie Monuments of Brittany. 
and was a tomb. Its floor and entrance were at about the level of 
the neighboring surface, and the entire monument is believed to 
have been covered with earth; thus in ancient times it was a 
tumulus. 
The menhir is a single stone planted on the earth and standing 
erect. 
The cromlech is a greater or less number of menhirs arranged in 
form of a circle or a square. 
The alignment is the same as the cromlech; only the menhirs 
are arranged in nearly parallel lines. 
All of these monuments consist of large unhewn granite stones. 
The smallest of the stones used we estimated to weigh a ton. Some, 
indeed many, have been accurately calculated upon the known basis 
of 2,700 grams for one decimetre cube, or say two tons avoirdupois 
for a cubic yard. ; 
The covering stones of a dolmen have been found to weigh five, 
ten, twenty, and forty tons. The alignment menhirs weigh from 
Fre. 1.—Dolmen of Crucuno, 
thirty to sixty tons: two near Plouharnel weigh respectively eighty- 
be and the 
three and ninety-six tons, the former that of Sainte Bar 
latter that of Erdeven. 
