182 
also to a bow which was said to have been found in the 
fens. 
Mr Bonney expressed his opinion that the inscription on 
the lanx was not UTERE FELIX, though he was unable to sug- 
gest any other reading. He called attention to an antler of 
a red deer on the table exhibiting cuts, and doubted whether 
the bow could have been found in the fen. 
May 2, 1870. 
Mr ToDHUNTER (Vice-President) in the Chair. 
New fellow elected : 
CLEMENT Hicerns, B.A. Downing. 
Communications made to the Society : 
(1) On the best form for the ends of Measures d bouts. 
By Professor Mintzer, F.R.S. 
After describing the various forms which had been commonly 
adopted, and pointing out their defects, the author stated that 
the best form was that of two ‘knife edges,” whose edges were 
in planes perpendicular to each other, and were not straight lines, 
but ares of circles, whose centre was the opposite end of the axis 
of the bar. In this case if J were the length of the bar, e the 
distance between the real and the assumed position of the point 
where the axis of the bar intersects the bounding surface, the 
4 
amount of the error was ~ ; while in the forms commonly used 
2 2 
it was 7 or a either of which quantities were considerably 
greater than the error in the form proposed by the author. 
(2) Note on supposed Molluse borings in the carboni- 
Jerous limestone of Derbyshire. By T. G. Bonny, 
B.D. 
The burrows described were in two localities, the first was 
in a band of limestone which crops out between two sheets of 
