108 TRANSACTIONS OF THE PLYMOUTH INSTITUTION. 
this gentleman's description of the manner in which he supposed 
the stones worked is palpable on examination. 
On the back, i.e. the convex side of the upper stone, are four 
holes, sunk from two to three inches, and about two inches in 
diameter, at equal distances from each other. Into these holes 
prongs were fitted which carried two bars, so that the stone was 
revolved by either horse- or man -power, similar to a capstan 
arrangement. 
The hole or eye of the nether stone was for the purpose of 
receiving a conical plug, the apex of which penetrated partly up 
into the eye of the upper stone, and served the double purpose of 
keeping the runner stone in position, and distributing the feed 
equally on the grinding surfaces. To further assist this are four 
curved master furrows or grooves, radiating from the eye of the 
grinding-surface of the upper stone. The mill, worked by men or 
horses, was of slow speed, and water was introduced to assist the 
propulsion of the ground material towards the grooved lip in the 
periphery of the stone. This and the feed were of course intro- 
duced through the circular hole in the top stone. 
The Eoman hand-mill was of precisely similar type to this, 
only smaller, and worked by one perpendicular handle fixed in the 
runner. 
There are remains of two watercourses visible. One undoubtedly 
is modern, and the other may have been used by the streamers ; 
but there are no traces of a wheel-pit, or anything to suggest 
water-power. 
These remains of a crazing-mill are of the greatest interest, and 
of considerable antiquity. It is to be hoped that steps will soon 
be taken to ensure their safety. 
On the site of what was evidently the blowing-house is a mould 
