P 
Report on the three Reports of the Liverpool Compass Committee and sy 
other recent Publications on the same subject. By ArcHispaLp SmitTH, 
M.A., F.R.S., and Frepertck Joun Evans, R.N., F.R.S........... 87 
vi CONTENTS. 
Report on Tidal Observations on the Humber. Presented by Jamss 
OxtpHam, C.E.; Jonn Scorr Russert, C.E., F.R.S.; J. F. Bareman, 
en arith si ele OMAR T BOMEPSON 5 osc evs so. . 2 2 Pease 101 
On Rifled Guns and Projectiles adapted for Attacking Armour-plate 
Defences, By T. Asron, M.A., Barrister-at-Law.............--- 103 
Extracts, relating to the Observatory at Kew, from a Report presented 
to the Portuguese Government by Dr. JactyrHo Anronto DE Sovza, 
Professor of the Faculty of Philosophy in the University of Coimbra. 
(Communicated by J. P. Gasstor, F.R.S.) .......6.0 22 ee eee ees 109 
Report on the Dredging of the Northumberland Coast and Dogger Bank. 
Drawn up by Henry T. Menyett, on behalf of the Natural History 
Society of Northumberland, Durham, and Newcastle-on-Tyne, and 
of the Tyneside Naturalists’ Field Club .............-.-+2+-005- 116 
Report of the Committee appointed at Manchester to consider and report 
upon the best means of advancing Science through the agency of the 
Mercantile Marine. By Curnserr Contrnewoop, M.B., F.L.S....... 122 
Provisional Report of the Committee, consisting of Professor A. Win- 
tiamson, Professor C. Wurarstone, Professor W. THomson, Professor 
W. H. Mirtrr, Dr. A. Marraressen, and Mr. Freemre Jenkin, on 
Standards of ‘Blectriegl Resistance ;:.:: 355522: .. 250") 2 SS soe 125 
Preliminary Report of the Committee for Investigating the Chemical and 
Mineralogical Composition of the Granites of Donegal, and the Mine- 
Falstassociated with them: «icc. < ste ae eh ee tees. Oe BO es 163 
On the Vertical Movements of the Atmosphere considered in connexion 
with Storms and Changes of Weather. By Henry Hennessy, F.R.S., 
M.R.LA., &c., Professor of Natural Philosophy in the Catholic Uni- 
Versity of Treland .2.) s16..%). ols ie aieisinie sles» lee eivisis's ole) -ielsidinialayale eleva 165 
Report of a Committee, consisting of the Rev. Dr. Luoyp, General Sazryg, 
Mr. A. Ssxarn, Mr. G. Jounstonzr Sronry, Mr. G. B. Arry, Professor 
Donxiy, Professor Wu. Toomson, Mr. Carrey, and the Rev. Professor 
Price, appointed to inquire into the adequacy of existing data for 
carrying into effect the suggestion of Gauss, to apply his General 
Theory of Terrestrial Magnetism to the Magnetic Variations........ 170 
On Thermo-electric Currents in Circuits of one Metal. By Frremine 
Umewen. (Ulibe Wye. 21 Soleil. ak ee ee See 173 
On the Mechanical Properties of Iron Projectiles at High Velocities. By 
DW oAUAGEB AGING DEI E: REV IPT Vals ajeyaye:'+: anche) -ounye a Bo Shhads feet 178 
Report on the Progress of the Solution of certain Special Problems of 
Dynamics. By A. Cayzey, F.R.S., Correspondent of the Institute.. 184 
Report on Double Refraction. By G. G. Sroxes, M.A., D.C.L., Sec. B.S., ‘ 
Lucasian Professor of Mathematics in the University of Cambridge .. 253 
