ON THE CRYSTALLINE ROCKS OF ANGLESEY. 325 
Hygroscopic water was determined by heating about a gram of powder 
in an air oven to a temperature of about 105° to 110° for an hour, and 
the loss in weight found. 
The total water (hygroscopic and combined) was estimated by igniting 
about a gram of powder, contained in a porcelain boat, in a current of 
dry pure air, and absorbing the water in a weighed calcium chloride 
tube. 
For the analysis of the limestones 269 A, 292, and 293 A, the method 
of procedure was as follows :— 
About a gram of rock-powder was treated with excess of concentrated 
hydrochloric acid in a platinum dish at the temperature of the water-bath 
and evaporated to complete dryness. The residue was treated with dilute 
HCl and the insoluble part filtered off and weighed. The metals present 
in solution as chlorides were then estimated in the usual manner. 
Investigation of the Fossiliferous Drift Deposits at Kirmington, Lincoln- 
shire, and at various localities in the Hast Riding of Yorkshire.— 
Report of the Committee, consisting of Mr. G. W. LamPLuan 
(Chairman), Mr. J. W. STatHER (Secretary), Dr. TEMPEST ANDER- 
Son, Professor J. W. Carr, Rev. W. LowEr Carter, Dr. A. R, 
DwerryHouse, Mr. F. W. Harmer, Mr. J. H. Howarru, Rev 
W. Jounson, Professor P. F. KENDALL, and Messrs. G. W. B. 
Macturk, EK. T. Newron, H. M. PLatnauverR, CLEMENT REID, and 
THOMAS SHEPPARD. (Drawn up by the Secretary.) 
As was intimated in our report for 1905, the work during the past 
year has been directed to the investigation of the deposit at Bielsbeck, or 
Bealsbeck, in the Vale of York, which was examined between seventy and 
eighty years ago by the Rey. W. V. Harcourt, and yielded the remains 
of numerous extinct mammals. The object of our investigation was 
mainly to ascertain if any further evidence could be obtained to show the 
relation of this fossiliferous deposit to the glacial drifts. 
The work, which was carried out under the superintendence of 
Professor P. F. Kendall, Messrs. G. W. B. Macturk and Thomas Sheppard, 
and the Secretary, confirmed the statements of the previous observers : 
(1) that the deposits yielding the bones rested immediately on the 
Keuper Marl ; (2) that they have been accumulated in a boggy hollow 
on an old land surface ; and (3) that at this particular locality there is 
no material that can be assigned to the direct agency of ice. It therefore 
still remains a debatable question whether the bone-bearing material was 
accumulated before, during, or since the Glacial period ; and it would 
appear that the elucidation of this matter will depend upon the investiga- 
tion of a wide area to determine what was the condition of the Vale of 
York during that period. 
The absence of glacial deposits in this part of the country may, on the 
one hand, imply that the area was never glaciated ; or, on the other 
hand, it may mean that glacial deposits once existing have been entirely 
removed, If the former be the case, the bone-bearing deposits might 
belong to the pre-Glacial or to any younger stage ; while if the latter 
