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3 
REPORTS ON THE STATE OF SCIENCE. 
Seismological Investigations.—Highteenth Report of the Com- 
mittee, consisting of Professor H. H. Turner (Chairman), 
Mr. J. Minne (Secretary), Mr. C. VERNON Boys, Mr. HoRAcE 
Darwin, Mr. F. W. Dyson, Dr. R. T. GuAzeBroox, Mr. 
M. H. Gray, Mr. R. K. Gray, Professor J. W. Jupp, Pro- 
fessor C. G. Knott, Professor R. Metnpona, Mr. R. D. 
OLDHAM, Professor J. PERRY, Mr. W. E. PuummMer, Dr. R. A. 
Sampson, and Professor A. ScHuSTER. (Drawn up by the 
Secretary.) 
[Prats I.] 
ConTENTS. ean 
I. General Notes, Registers, Visitors, Stations . : é : ' 45 
WY, Sezsmic Activity in 1910- «2 es wa ta“ pin IF" 46 
III. On the 443 or 452 Day Period... filam Stoo" 51 
IV. On the Determination of the Position of Epicentr es : 51 
V. On the Variation of Harthquake Speed with the Variation in the Direction of 
Propagation 52 
VI. Comparison of the Amplitudes of the East-West and North-South Motion at 
a given Station 351.55 
VII. On the Direction in which Earthquake M otion i is m ost easily propagated » 56 
VIII. On the Times of Occurrence of Maximum Motion on Pendulums differently 
Oriented . . 59 
IX. Disturbances only ‘recorded at Two or Three Widely y Separated Stations . 60 
X. Recurrence of Megaseismic Groups . . . .» 61 
XI. Frequency of Earthquake Followers . 62 
XII. Large Earthquakes recorded at different Obser vatories, January y to June 1910 63 
KIT. Seismic and Volcanic Activities. . . 65 
_ XIV. Report on an Improved Seismograph 67 
XV. Indexing Materials published by the Br itish Association and the Seismo- 
logical Society of Japan relating to Geoph uses Bee 68 
XVI. Shinobu Hirota: Obituary Notice .  . Sy oe a Gi 
XVII. John Milne; Obituary Netice : 85 
I. General Notes. 
Tue above Committee seek to be reappointed with a grant of 60I. 
The expenditure in connection with seismological work during the 
last twelve months exceeded 300]. This covered the salaries of two 
assistants, sundry expenses connected with the Observatory at Shide 
in carrying out the work connected with 58 co-operating stations. 
Out of the above sum 2001. was kindly placed at the disposal of your 
Secretary by the Government Grant Committee of the Royal Society. 
Registers.—During the last year Circulars Nos. 26 and 27 have 
been issued. They contain 117 pages of entries which refer to the 
following stations: Shide, Kew, Bidston, Stonyhurst, West Bromwich, 
