306 REPORTS ON THE STATE OF SCIENCE, ETC. 
the conductivities should be compared with the strata temperatures measured 
in the same places. 
(2) A first series of experiments should be made to determine the conduc- 
tivity and temperature gradient in rocks that are homogeneous for some tens 
of feet beneath the surface, as in the area of the outcrop of the Gault near 
Cambridge. 
(3) Members are asked to get into touch with mining undertakings at 
places where deep borings are being made, and to arrange for the collection 
of specimens and the determination of underground temperatures before 
disturbing conditions can have opportunity and time to become effective. 
The Committee asks for reappointment with a grant of £35. 
QUANTITATIVE ESTIMATES OF SENSORY EVENTS. 
Second Interim Report of Committee appointed to consider and report upon 
the possibility of Quantitative Estimates of Sensory Events (Prof. A. 
FERGUSON, Chairman; Dr. C. S. Myers, F.R.S., Vice-Chairman ; 
Mr.R.J. BarTLetT, Secretary ; Dr. H. Banister, Prof. F.C. BARTLETT, 
F.R.S., Dr. Wm. Brown, Dr. N. R. CAMPBELL, Prof. J. DREVER, 
Mr. J. Guitp, Dr. R. A. Houston, Dr. J. C. Irwin, Dr. G. W. C. 
Kaye, Dr. S. J. F. Pottpott, Dr. L. F. RicHarpson, F.R.S., Dr. 
J. H. SHaxsy, Mr. T. SmitH, Dr. R. H. TuHouress, Dr. W. S. 
TUCKER). 
(1) Experimental investigation and research into the records have been 
continued, and interim reports have been received of the work being carried 
out at Cardiff and Cambridge. 
(2) These reports and certain aspects of the theory of measurement have 
been discussed by correspondence. 
(3) Before the accumulated information can be reduced to report form 
in a satisfactory manner, it seems desirable that experimental work in 
progress should be carried somewhat farther, and that a report on research 
being made into the records of previous work should be available. 
(4) The Committee therefore asks to be re-appointed without grant. 
PHOTOGRAPHS OF GEOLOGICAL INTEREST. 
Twenty-seventh Report of the Committee (Profs. E. J. GARwoop, Chairman ; 
and §. H. ReyNnoxps, Secretary; Messrs. G. Macponap Davies, J. F. 
Jackson, J. Ranson, Prof. W. W. Watts, and Mr. R. J. WELcH). 
In the present report 308 photographs are listed, bringing the number in 
the collection to 8,711. 
The present series includes an interesting set from Cornwall contributed 
by Mr. E. H. Davison, and some beautiful whole plate photographs illustrat- 
ing coast erosion near Sidmouth given by Mr. Harold Preston, also sets 
from Lundy Island by Mr. O. D. Kendall,from Dorset by Dr. W. J. Arkell, 
from Nottingham by Prof. H. H. Swinnerton, and from Donegal by Dr. 
W.J. McCallien. Dr. E. Greenly has presented an interesting series of the 
