JULY, 1897. 
CONTENTS. 
VI. —Some Remarks on Difficulties of Meridian Circle Work. By 
Arruur E. Lystrr, M.A., 375 
I.—A Method of Using Common Petroleum as the Iluminant for 
_ Beacons and Buoys by which a Continuous Light may be 
_ maintained, Day and Night, for Weeks or Months, without 
the Necessity for the Attendance of a Light-keeper. By 7 
Joun R. Wicuam, M.R.I.A., Member of the Council of the fe 
Royal Dublin Society, : 377 
Ti. —On Hamilton’s Singular Points and Planes on Fresnel S Wave 
in Surface. By Proresson WILLIAM Booru, M.A., Hoogly 
College, Bengal, 381 
XLIX. —On the Rotation-Period of the “Garnet” Spot on Ji upiter. By Hae, 
; Artuour A. Rampavt, M.A., D.Sc., F.R.A.S., . 389 
i L.—Note on Irish Annelids in the Mice ul ot Science anid Art, 
Dublin.—No. I. By W. C. M‘Invosu, Professor of Natural 
Bea History in St. Andrew’s University, . 399 
ot, —The Hydroids of the Irish Coast. By J. E. Duprpey, A.B.C. Sc. sa 
(Lond.) ; Curator of the Museum, Kingston, Jamaica, 21 AOGi wea 
Si LIL. .—The Distribution of Drift in Ireland in its relation to Agricul- 
ture. By J. R. Kirrox, (formerly) F.C.S., H. M. Sean 
Survey. (Plate XV.), 421 
& “LIL. —Note onthe Worm associated with “Lophohelia pr olifera. By 
ha Fiorrence Bucwanan, 432 
LIV.—On some Dragonflies in the Dublin Museum of Science and 
Art. By Grorer H. Carpenter, B.Sc. (Lond.), Assistant 
Naturalist in the Science and Art Museum, Dublin. (Plate 
XVI.), 434. 
LY.—The Geographical Distribution of Dragonflies. By Gnorex H. 
Carpenter, B.Sc. (Lond.), F.E.S., Assistant Naturalist in 
the Science and Art Museum, Dublin. (Plate XVII.), . 439 
a INI. —Application of the Parallelooram Law in Kinematics. By © 
Tomas Preston, M.A., F.R.U.1L., . 469 
LVI. —Report of the Committee consisting of Professor W. J. Solas, ane 
5 LL.D., F.R.S., R. Lloyd Praeger, BA., BLE. A. FL Dixon heii 
M.B. wand Alfred Delap, B.A., B.E. , appointed by the Royal — 
Dublin Society to investigate ‘the recent Bog-flow in Kerry. 
Drawn up by R. Lioyp Prarenr and PRoressor SoLuas. ch) 
(Plates XVIII. and XIX.), t , ‘ ; : . 475 
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