CONTENTS. 
(A) 
VOL. 186.—PART I. 

I. On the Newtonian Constant of Gravitation. By C. V. Boys, A.R.S.M, F.RS.. . 
Assistant Professor of Physics, Royal College of Science, South Ken- 
SOIC LOT Mer a er te cosa Wide Gale Me aa, Pg iol ieny SV eee page 1 
Il. On the Photographic Spectrum of the Great Nebula in Orion. By J. NoRMAN 
OGRA ER Ot AD Sse ey ta celia fl Ra, a SO dBc oie irene anny Pee E SS 
Ill. Propagation of Magnetization of Iron as affected by the Electric Currents im 
the Iron. By J. HorKinson, F.R.S., and H. WILSON. .... . . . 98 
IV. On the Dynamical Theory of Inconypressible Viscous Fluids and the Determination 
of the Criterion. By Osporne Reynowps, V.A., LL.D., F.RS., Professor of 
Engineering in Owens College, Manchester . . . . ..... ~. 128 
V. On a Method of Determining the Thermal Conductwity of Metals, with 
Applications to Copper, Silver, Gold, and Platinum. By James H. Gray, 
M.A., B.Sc., late “1851 Exhibition” Scholar, Glasgow University. Commu- 
ALCON COADUPUOTOL SWORE VINEE SHiiSs)) re oe ess) i ee vee ee ce ae OD 
VL. Argon, a New Constituent of the Atmosphere. By Lord Rayueicu, Sec. B.S., 
DUET OESSOT. NV MGHEAM SEUAMISAY, EheS.. <5 0 2 8 ee LOY, 
MDCCUXCV.—A. c 
