CONTENTS. 
; P. 
Sir W. Tomson on the Effect on the Compass of the Rolling of Ships .... 
Professor Gustav WisDEMANN on the Proportions in which Bases and Acids 
present in a Solution combine with each other .........+e++00: iialafateeats 
Mons. Aur. Nravpet Brequet’s Notes of Experiments on the Electric 
Currents produced by the Gramme Magneto-electric Machine........+5.. 
METEOROLOGY. 
Mr. Isaac Asue on the Cause of the Progressive Motion of Cyclones, and of 
the Seasonal Variations in their Paths... 1.1... cece cece eee cece ee enes 
Mr. R. B. Betcuer on Disturbance of the Weather by Artificial Influences, 
especially Battles, Military Manceuvres, great Explosions, and Conflagra- 
ee TE ST ia Reale cee erste lace colele ef efelshafeis's cielo siaidalatele olaitfelslaisia gs 
Mr. Henry F. Buanrorp on certain protracted Irregularities of Atmospheric 
Pressure in the Indian Monsoon Region, and their relation to Variations of 
the Local Rainfall ..........0c cece ee cree eee eeeees a trtiet constey sie ete = ac 
Mr. T. Morrat on the apparent Connexion between Sun-spots and Atmo- 
spheric Ozone ......ss sees eeeeeen eect ence enerees tis ssneneeses eens 
Mr. F. Pasrorexi on a Gymbal-swung Rain-gauge ...s esses e sense rene é 
of Strong Winds....... sce cece eee eee eee ee eee e teen ener teen nes 
Mr. Joun SmyTH, jun., on the Meteorology at Banbridge for ten Years, and 
Rainfall of Ulster ......cceeee ces eeeee SRirido orion cdociinebend 5Ge =< 
Rey. Fenwick W. Srow on the Absorption of the Sun’s Heat-rays by the 
Vapour of the Atmosphere..... 1... sse se ee reece een ete ee nee eens Abie 
Lieut.-Col. A. StRanGE on the Necessity for placing Physical Meteorology 
on a Rational Basis......cseee sees rene eee eeeeeee Tack HO) Se OAT OO CO 
Mr. G. J. Symons on the Relative Sensitiveness of Thermometers differing in 
Size, Shape, or Materials ......+-+.+eeeeeeees stigmas ue bec “jagogioe 
on a New Form of Rain-gauge .sssessseeeeeveves Aine 
Instruments &c. 
‘Professor W. F. BARRETT on an Apparatus for showing the Interference of 
Sound ....+. pe ctatehal-y ibis Tas) sie, sieaehs aii Som ao ace? Sl etoitereiiets s Aaa Woah 
Mr. Howarp Gruss on Improvements in Equatorial Clocks ..........+4.- 
My. F. Hersert Marsuatv’s description of a Trompe or Blowing-Engine for 
giving a supply of Coal-gas under Pressure for Sensitive Flames ........ 
Mr. G. J. Morrison on the Adoption (for the general purposes of Navigation) 
of Charts on Gnomonic Projection instead of on Mercator’s Projection .... 
My. Henry Necrettr on Negretti and Zambra’s Patent Recording and Deep- 
sea Thermometer.......cceccereecceecnreencenseaeneeeasensonsseaes 
My. S. OC. Trstey on a Four-Pendulum Apparatus... ....+.. PaO S loti Oo 
CHEMISTRY. 
Address by Professor A. Crum Browy, M.D., F.R.8.E., F.C.S., President of 
1. SQEETOI 6 G2 8 acceepelnio it u.0 DISIRINIODIO cao a gtOI OGIO OOF OO Gag OL Oni CE oa 
Dr. Anprews on the Composition of an Inflammable Gas issuing from below 
the Silt-bed in Belfast........065 PASC OORO OP DOO OULU OORT tC. 
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