94 NOTES ON A BONE OBJECT. poles by which the users of the bone skates propelled themselves, the bone point being said to get a better grip on the ice than iron, although, as we have seen above, Fitz-Stephen distinctly states that iron was used for this purpose. A few exceptional instances of pin-polishers have occurred in positions favouring the supposition of their use in earlier times;6 but, from the large number of these objects I have seen dug up in recent years, under conditions favourable for observation, there is no doubt that the great majority of them belongs to the Tudor period. Even at the present time, however, a very similar method of shaping pins for special purposes is resorted to by working jewellers, but a squared piece of box-wood having grooves is generally used instead of bone. It may be that these pin-polishers are the lineal descendants of such implements as the one from Braintree, but have become modified to adapt their use to a finer material. Between these two classes of objects a connecting link may be supplied by the grooved block from York, which appears to have been employed in the making of bone pins. If any such purpose was served by the Braintree implement and its fellows, it Fig. 16.—BONE point found AT MOORFIELDS, LONDON (IN POSSESSION OF WRITER). must have been employed as a rest to hold the stock of the object to be manipulated, as no sign of the operation is apparent on the bone. Not only is the use which these shaped bones may have served surrounded with doubt, but the period to which they belong is equally obscure. As is usual with the majority of such relics, the precise circumstances of their discovery have either not been re- corded or the records are insufficient to determine this question. All of them are from sites making an ancient origin possible, though the cities of London, York, and Colchester, having been continuously occupied from at least the Roman period down- wards, it is necessary to exercise great caution in assigning such objects to a definite age. Later objects frequently occur in the soil of the Roman level, through the sinking of weils, cesspools, and other excavations. In such cases, the depth at which the 6 Archaeological Journal, lx. 200.