160 REPORT—1905. 
bromine atoms, no addition is possible. With R! and R? both C,H; 
groups, the replacement of R® or R* by bromine is sufficient to prevent 
addition of bromine, but not if R* or R* or both be replaced by methyl. 
As examples, stilbene, methy]stilbene, bromostilbene and diphenylethylene 
add on bromine, but dibromostilbene and carinii > do not. 
Investigation of the Fossilifer ous Drift Dates at Kirmington, Lincoln- 
shire, and at various localities in the East Riding of Yorkshire.— 
Tteport of the Committee, consisting of Mr. G. W. LampLuana 
(Chairman), Mr. J. W. StarHer (Secretary), Dr. TemMPpEstT ANDER- 
son, Professor J. W. Carr, Rev. W. Lower Carter, Mr. A. R. 
DwerryHouse, Mr. F. W. Harmer, Mr. J. H. Howartn, Rev. 
W. Jounson, Professor P. F. KenpvaLtit, Mr. H. B. Murr, Mr. 
EK. T. Newton, Mr. CLeMent Rep, and Mr. THoMAS SHEPPARD. 
THE last report of the Committee (Cambridge, 1904) described the com- 
pletion of successful work at Kirmington and at Limber, Lincolnshire. 
Since then the Committee have commenced operations at two Jocalities in 
the East Riding of Yorkshire, viz., Bielbecks and Speeton ; but owing to 
the early date at which this report has to be rendered, and to other cir- 
cumstances, it has been found impossible to send in a report of completed 
work at either of these places. 
Bielbecks.—This place is situated in the Vale of York, two miles south 
of Market Weighton and one mile north-west of North Cliff. Between 
seventy and eighty years ago a rich deposit of mammalian and other 
remains was accidentally discovered here, and were subsequently described 
in the ‘ Philosophical Magazine,’ September 1829, by the Rev. W. V. Har- 
court. A large number of specimens were obtained, the bulk of which 
are, we believe, in the museum at York. The deposit is obviously a very 
important one, and it has long been felt that, if possible, more informa- 
tion as to its precise nature should be obtained. With this object in view 
your Committee have put down borings, and have been able to locate 
the black marl which is believed to contain most of the bones and shells. 
Later in the year—probably in July—it is intended to make a large 
excavatior of which a detailed report will be prepared and presented at 
the York meeting in 1906. 
The ‘ Speeton Shell Bed.”—This bed was seen by Professor Phillips in 
the year 1855, and a brief account of it occurs in his ‘ Geology of York- 
shire,’ vol. ii, The bed was described more fully by Mr. G. W. Lamplugh 
in the ‘Geological Magazine’ (1881, p. 176). Since then the bed has 
become much obscured by slips. As the relationship of this bed to the 
glacial drift is still a debatable matter, your Committee decided that 
the bed came within the scope of their investigations. With the assistance 
of Mr. C. G, Danford, of Reighton, an excavation has been made, and 
a clean section down to the base of the shell bed obtained. The 
details, however, have still to be worked out. 
The thanks of the Committee are due to W. H. Fox, Esy., for permis- 
sion to excavate at Bielbecks, and also to the Right Hon. the Earl of 
Londesborough for permission to investigate the shell bed at the base of 
the drifts at Speeton. 
The Committee request to be reappointed, with por to use the 
-unexpended balance of last year’s grant. 
