TERTIARY AND CRETACEOUS ROCKS 271 
QUANTITATIVE ESTIMATES OF SENSORY EVENTS. 
Interim Report of Committee appointed to consider and report upon the 
possibility of Quantitative Estimates of Sensory Events (Dr. A. 
Fercuson, Chairman; Dr. C. S. Myers, C.B.E., F.R.S., Vice- 
Chairman; Mr. R. J. Bartiett, Secretary ; Dr. H. BANIsTER, Prof. 
F. C. Bartuett, F R.S., Dr. WM. Brown, Dr. N. R. CAMPBELL, 
Dr. S. Dawson, Prof. J. Drever, Mr. J. Guitp, Dr. R. A. Houstoun, 
Dr. J. O. Irwin, Dr. G. W. C. Kaye, Dr. S. J. F. Porvport, Dr. L. 
F. Ricuarpson, F.R.S., Dr. J. H. SHaxsy, Mr. T. Situ, F.R.S., 
Dr. R. H. Tuouress, Dr. W. S. Tucker). 
THE Committee met on four occasions ; memoranda prepared by members 
have been circulated. 
The memoranda which have been circulated have dealt critically with 
(a) the possibility of quantitative estimates of sensory events, (b) the mean- 
ing of the term measurement in its application to the estimation of sensory 
magnitudes, and (c) the validity of the modes of presentation and interpreta- 
tion of the Weber-Fechner law. 
The matters so raised and discussed have resulted in the resolving of 
many doubtful points and in raising clear-cut issues of fundamental import- 
ance, but it is evident that further discussion and research are necessary 
before a satisfactory synthesis of opinion can be effected. 
The Committee is agreed that (a) a critical résumé of past work on the 
Weber-Fechner law, paying special attention to experimental conditions and 
introspective reports, would be of great value ; and that (b) further experi- 
mental work should be undertaken on the measurement of just noticeable 
differences, equal-appearing intervals, and ratio estimates in the various sensory 
fields, full use being made of modern physical instruments. 
In furtherance of the above, at the suggestion of the Committee, work has 
been commenced at Cambridge, at Cardiff and at Edinburgh, and it is hoped 
that other psychological laboratories will be able to give assistance later. 
The main work of the Committee is necessarily carried out by the 
interchange of memoranda between its members, and the Committee desires 
to record its indebtedness to the Council of the British Psychological Society 
for their hospitality and for the assistance which they have given in the 
duplication of the memoranda involved. 
- The Committee asks to be reappointed, without grant. 
TERTIARY AND CRETACEOUS ROCKS. 
Report of Committee appointed to investigate Critical Sections in the 
Tertiary and Cretaceous Rocks of the London Area and to tabulate 
and preserve records of new excavations in that area (Prof. W. T. 
Gorpon, Chairman; Dr. S.W. Woo.pripce, Secretary; Mr. H. C. 
BERDINNER, Prof. P: G. H. Boswett, O.B.E., F.R.S., Miss M. C. 
CrosFiELD, Mr. F. Gostinc, Prof. H. L. Hawkins, Prof. G. 
HICKLING). 
THE grant allotted to the Committee for 1932-33 was expended in investi- 
gating the structure of a critical area south of the Lower Greensand 
