180 REPORT—1896. 
of determinations which have been made. Further comment would be 
premature, but they show that there is a wide field for future investiga- 
tion opened up in following the changes of level which attend changes i in 
form. The general tendency to rise shown by clouds forming is well 
marked, and this is also true of the ascent of the general cloud-levels 
towards the early afternoon. But many more observations are required 
before such questions can be discussed. The negatives also contain mater‘al 
for some determinations of cloud velocity in a horizontal plane, but time has 
not allowed of any being made as yet. 
Your Committee think, therefore, that the observations should certainly 
be continued, as they promise to throw considerable light on many ques- 
tions, and will at least give material for instructive comparison with 
other determinations made in America and on the Continent. 
Your Committee have done little to add to their collection, the time 
at their disposal having been almost entirely taken up by the cloud 
measurements. 
In conclusion, they would ask for reappointment, with the addition of 
Mr. H.N. Dickson, and a renewal of the grant of 15/. 
Seismological Investigation.—First Report of the Committee, consisting 
of Mr. G. J. Symons (Chairman), Dr. C. Davison and_ Professor 
J. Mine (Secretaries), Lord Krtvin, Professor W. G. ADAMS, 
Mr. J. T. Borromiey, Sir F. J. BraMwe tu, Professor G. H. 
Darwin, Mr. Horace Darwin, Mr. G. F. Deacon, Professor 
J. A. Ewrne, the late Professor A. H. GREEN, Professor C. G. 
Knorr, Professor G. A. LEsour, Professor R. MELpoua, Professor 
J. Perry, Professor J. H. Poyntine, and Dr. Isaac Roserts. 
CoNTENTS. 
Report of Committee . 180 
I. Notes on Instr uments 0 hich will record Earthquakes of Feeble fl ntensity. 
Professor J. MILNE, /.R.S. (Also see Section VII. and Appendix.). 181 
Il. Observations with Milne’s Pendulums T and U, 1895-1896. Professor 
J. MILNE, F.B.S. : ; : - . 184 
The Localities and their Geology : ~ 4 re . 184 
The Instruments T and U and their Installation : : . Pee coy fl 
Artificially produced Disturbances . 5 . 188 
Sudden Displacements and Earthquakes in the Isle of W “ight. 5s) 
Earthquakes recorded in Europe, and possibly noted in the Isle af 
Wight, August 19 to March 1896 3 191 
Notes on Special Earthquakes. (See also Appendix, p. 229. we ep Ss 
Tremors and Pulsations, their relationship to the howrs of the day. 
Air-current effects. Effects of barometric ali temperature, 
frost, rain, Se.  . ‘ c : 5 d . 200 
Diurnal Waves z 212 
Ill. Changes in the Vertical observed in Tokio, ‘September 1894 to March 
1896. Professor J. MILNE, 7.2.8. . . 215 
IV. Experiment at Oxford, dramn up by Professor H. ia TURNER F ee 
V. The Perry Tromometer. Professor JOHN PERRY, F.2.S. : 3 . 218 
VI. Earthquake Frequency (a Note). Dr. C. G. Knott, F. 2.8.2. é . 220 
VII. Instruments used in Italy. CHARLES DAVISON, Se.D. . . 220 
Ar the Ipswich meeting of the Association it was resolved that the 
two committees which were studying vibrations of the earth’s crust, viz., 
