CONTENTS 
OF VOL. 149. 
I. Researches on the Foraniinifera. 
&c 
By William B. Caepentee, M.B., F.R.S., F.G.S. 
page 1 
II. Description of some 
from Australia. 
Remains of a Gigantic Land-Lizard (Megalania prisca, Owen) 
By Professor Owen, F.R.S. &c 43 
III. On some Remarkable Relations which obtain among the Roots of the Four Squares 
into which a Numbei' may be divided., as compared with the corresponding Roots of 
certain other Numbers. By the Right Hon. Sir Feedeeick Pollock, F.R.S. ^ Lord 
Chief Baron 
IV. A Sixth Memoir upon Quantics. By Aethue Cayley, Esq., F.R.S. .... 61 
V. On some Thermo-dynamic Properties of Solids. By J. P. Joule, LL.D., F.R.S., 
F.C.S., Hon. Mem. Phil. Soc. Cambridge, Vice-President of the Lit. and Phil. Soc. 
Manchester, Corresp. Mem. R.A. Sc. Turin, &c 91 
VI. On the Thermal Effects of Compressing Fluids. By J. P. Joule, LL.D., F.R.S., 
F.C.S., Hon. Mem. Phil. Soc. Cambridge, Vice-President of the Lit. and Phil. Soc. 
Manchester, Corresp. Mem. R.A. Sc. Turin, &c 43^ 
VII. On the Stratifications in Electrical Discharges, as observed in Torricellian and other 
Vacua. — Second Communication. .Sy John P. Gassiot, . . . 137 
VIII. On the Vertebral Characters of the Order Pterosauria, as exemplified in the Genera 
Pterodactylus (Cuviee) and Dimorphodon (Owen). By Professor Owen, F.R.S., 
Superintendent of the Natural History Departments in the British Museum 161 
IX. On the Comparison of Hyperbolic Arcs. Py Chaeles W. Meeeipield. Communicated 
by the Rev. Dr. Booth, F.R.S. 471 
X. On the Thermo-dynamic Theory of Steam-engines with dry saturated Steam, and 
its application to practice. William John Macquoen Bankine, C.E., LL.D., 
F.R.SS.L. & E., Pres. Inst. Eng. Scot., Regius Professor of Civil Engineering and 
Mechanics in the University and College of Glasgow 477 
