vi CONTENTS. 
Miscellaneous Scientific Intelligence and Bibliography.—Patent regenerative Gas-furnaces 
of C. W. & F. Siemens, 232.—National Academy of Sciences, 234.—- Lawrence Scien- 
tific School, 235.—-Obituary—-Capt. James M. Gilliss, U. S. N.: George P. Bond, 235.— 
Dr. Hugh Falconer, 236.—Bibliography.—The Differential Calcu!us, by Jonn Spare, 
M.D.: History of Delaware County, Pennsylvania, with a hg ce fed its Geology, Min- 
erals, Plants, Quadrupeds and Birds, by Gzorer Smitu, M.D., 
NUMBER CXVII. 
Art. XXVII. On Molecular Physics; by Prof. W. A. Norton, 
XXVIII. On the combination which takes place when Light of 
different tints is —— to the iG and left eye ; 2 Prof. 
O. N. Roop, - 
XXIX. On an ria with this Gyroscope ick Prof 0. N. 
ooD, 
XXX. Daaeipiied Sat a aaiagle apparatus for peter eee 
without the use of Lustrous surfaces or of the imap cc ; 
by Prof. Ocpen N. Roop, - 
XXXI. Remarks on the Beatrice, a new , Division of Melee ; 
by Avrueus Ayvart, Jr, . - 
XXXII. The Albert Coal, or Alberta: oI of es Brunei o 
Cuartes H. Hircacock, 
XXXIII. Detection of the idobeestion of end Oils with Oil 
of Turpentine by the Saccharimeter ; by Dr. Junius Mater, 
XXXIV. Introduction to the Mathematical Principles of the Neb- 
ular Theory, or Planetology ; by Prof. Gustavus Hinricus, 
XXXV. The determination of the height of Auroral Arches from 
observations at one place; by H. A. Newron, : 
XXXVI. On the Iron Ores of ae ae y 7 re 
Krmsatt, Ph.D., 
XXXVIL. Aaisonniaiel Piccmupee! by ioe M. Resasatens 
XXXVIII. Notes on Coal and Iron Ore in the State of —— 
Mexico; by the late N. S. Manross, é . 
IX. Numerical Relations of Gravity and Magne ; Me 
Pony Earte Cuass, M.A., - . 
XL. On the Origin and Formation of Pvairisd ; sy Las Lawes 
QUEREUX, ~~ eS j : 
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