Contents. 
PART VI.—continued. 
LXI.—Notes on a Paper recently Published in the Astrophysical 
Journal, by Professor E. Hale, of the Yerkes Observatory, 
Chicago, on “‘the Comparative Values of Refracting and 
Reflecting Telescopes for Astrophysical Observations.”” By 
Str Howarp Gruss, F.R.S., Vice-President, Royal Dublin 
Society, 
LXII.—A Mechanical Cause e TElamoeeuchie of Sancine and Seraenene 
Geometrically investigated ; with Special Application to Crys- 
tals and to Chemical Combination. By Witi1am Bartow, 
LXIITI.—Arrangement of the Crystals of certain Substances on Solidifica- 
tion. By Frep. T. Trovuton, D.S8c., F.R.S., : 
LXIV.—Phellia Sollasi: A New Species of Aetnimian from Ooemnt, 
By Atrrep C. Happon, M.A., D.8c., Professor of Zoology, 
Royal College of Science, Deli, 
LXV.—The Apparent Cometary Nature of the Spiral inonalah in Canes 
Venatici. By W. E. Witson, F.R.S. (Plate XXI.), . 
LXVI.—A Theory of Sun-spots. By I. Jory.) MeAR DESCy. WoknGe 
Hon. Secretary, Royal Dublin Society, Professor of Haney 
and Mineralogy in the Uuiversity of Dublin, 
LXVII.—Of Atmospheres upon Planets and Satellites. By G. JouNsTONE 
Stoney, M.A., D.Sc., F.R.S. (Adstract), 
LXVIII.—A Aceon ‘Analysts of Iron Meteorites, cidenglited and 
Meteoric Stones. By W. N. Hanrruzy, F.R.S., and Hueu 
Ramacez, Assoc. R.C.8ce.1., F.I.C. (Plates XXII., XXIIL., 
XXIV., 
LXIX.—On the Mouneiae of the Tiere Rawlend Shawnie & in the 
Royal University of Ireland. By W. E. Apsnry, D.Sc., 
F.1.C., Curator in the Royal University, and James Carson, 
Are OHS (eb aan Onl dep : : : : 5 : 3 
LXX.—Notes on certain Actiniaria. By Dr. Karurermne Macurre. 
(Plate XXIV a.), : ? : ‘ : : 
LXX1I.—On the Occurrence of Asvoions (Xanthitane ?) and Brookite in 
the Quartzites of Shankill. By Prorzussor J. P. O’Reriiy, 
C.E., Royal College of Science, Dublin. (Plate XXY.), 
LXXII.—On some Minute Organisms found in the Surface-water of Dublin 
and Killiney Bays. By J. Jouy, D.Sc., F.R.S., Hon. Sec., 
Royal Dublin Society ; and Henry H. Drxon, D.Sc. (Plates 
XXVI. and XXVII.), 
LXXIII.—An improved Form of Hydrometer iy ath ‘hel Speortie Gravis 
of Liquids may be accurately determined at any Temperature. 
By the Rey. H. O’Toouz, of Blackrock College, County of 
Dublin, : : , ; : 3 : : 
INDEX, 
List or Screntiric PuBLicaTIons. 
List or EXCHANGES. 
Vil 
PAGE 
523 
527 
691 
693 
696 
697 
701 
703 
711 
“lel 
732 
741 
753 
757 
