: 
EARTH PRESSURES 247 
EARTH PRESSURES. 
Ninth Interim Report of Committee on Earth Pressures (Mr. F. E, 
WENTWORTH-SHIELDS, O.B.E., Chairman; Dr. J. S. Owens, Secre- 
tary; Prof. G. Coox, Mr. T. E. N. Farcuer, Prof. A. R. Futton, 
Prof. F. C. Lea, Prof. R. V. SOUTHWELL, F.R.S., Dr. R. E. STRADLING, 
Dr. W. N. Tuomas, Mr. E. G. WaLksr, Mr. J. S.. WiLson). 
SINCE their last report, the Committee have learnt with deep regret that, 
owing to serious illness, Prof. Jenkin has been obliged to abandon the work 
in which he and they have been so keenly interested. 
The Committee would like to place on record their very high apprecia- 
tion of the great value and importance of Prof. Jenkin’s contribution ‘to 
the solution of earth pressure problems. 
The Committee have received a report from Prof. Jenkin, in which he 
summarises his general conclusions at the stage when he was obliged to 
discontinue his researches. He also emphasises the practical importance 
of the subject, and the desirability of completing the investigation. The 
report is attached. 
The Committee have also before them a report from the Research 
Station, written by Mr. D. B. Smith, B.A., which is an account of his 
collaboration with Prof. Jenkin on the experimental work on Kaolin, which 
has been carried out at the Research Station since 1932. 
This work is not complete, but the Committee hope it will be published, 
either by the Association or elsewhere, because it contains very valuable 
_ information and also because it will give most useful guidance to future 
investigators. 
Although, if Prof. Jenkin had been able to continue his work, he would 
doubtless have made some further experiments on these lines, he has 
expressed the view that this particular field of investigation will not yield 
much further result. 
Nevertheless, Dr. Stradling is anxious that the Committee should continue 
to keep in touch with the work connected with earth pressures which is 
being carried out at Garston. 
The Committee too are anxious to do so, because they realise that this 
work will assist the solution of those earth pressure problems which are its 
chief interest. 
They therefore ask to be reappointed. 
THe MECHANICS OF GRANULAR MATERIAL 
BY 
C. F. JENKIN, C.B.E., F.R.S. 
Preface. 
The writer has been working at the theory of the mechanics of granular 
material for many years ; his researches have now been brought to an end 
by failing health. This paper summarises the general conclusions at which 
he has arrived, and may be of some use to those who follow ; it does not 
pretend to be a scientific paper, for no proofs of the statements it contains 
are given. 
