vi CONTENTS. 
NUMBER LIL 
Page 
Arr, XXVII.—The History - Young’s eee of his The- 
ory of Colors; by Atrrep M. Maygr, _.. .--..____-. 251 
XXVITL—A rede cohintion of the Coasagls of the Law 
connecting the Pitch of a Sound with the Bes say a of its 
Residual Sensation; by Atrrep M. Mayer, .________- 267 
—On the action ‘of the less Bikuahe rays of Light 
on Silver Iodide and Bromide; by M. Carry Lxa,_--.- 269 
a —On the Silurian age of the Southern REY 
By Vane £. WES oo. vil os es ce 279 
XXXI.—Bentham, On the recent Progress and present State 
of Systematic’ OUR as oc ee eek a 288 
Bern Sy ede ee of Gases from Meteoric 
Ir y Anrnun W. Welewroo soo 94 
XXXIIL.- —The user of the dpi of the principal 
Star of 2 1007; by &. W. Buena... 2.0.3 302 
SCIENTIFIC INTELLIGENCE. 
Acid, | Aelita 303.—New Salts and reactions of Ceesium a ubidium, 
GopEFFROY: On Diethylearbinol, a new i f Amyl alcohol, Widens and 
< emraac 04.—Production of Allyl alcohol in th of 3 
ARONH the Gases evolved from Apples, BENDER: On the influence of 
Light ae Cane Sugar, Kreuster, 306.—Reflecting Lever, Cornu: f 
the Solar Spectrum, Lockyer, Hisiiae y and Cornu, 307.—Index of Refraction 
of thin plates, WreDEMANN, 308. 
Geology and Natural caer he Bi Melon of certain datum-points on the Great 
Lakes and Rivers and in Rocky Mountains, by Jamus T. GARDNER, 309.— 
e 
rmian of Weissig in Saxony, E. Gurnrrz, 322.—Batrachians in bituminous 
shales of the Permian at Millery, France: Coal in Patagonia: Icones Muscorum, 
ete., by the late W. 8S. SuLnivant, 323.—Attar of sot ge on sc en Wild Flowers 
considered in relation to Insects, by Sir Joun Lusgock, Amphipod Crusta- 
ceans of the a mily Gammaride in Lake Baikal: Large  Cephalopo: The Doe- 
and Darwinism, » by Oscas epee 
Astronomy.— ¥en Society fo n the Sun: Astro- 
pects and SMobardlaatoal Obs ervations oe the: year 1872 at the U. 8. Naval 
Observatory fessor Argelander, 327. 
neous Intelligence.—Ge eogra pel and re ec ray eo a8 and Surveys 
west of th the 100th “Meridian i in 1872, 328.—Smithsonian Contributions to Knowl- 
edge, 1874: Chemical Examination a Alco stl eton. y y 3. PRESCOTT: 
Appleton’s Cyclopedia, 329.—Transactions of the American Institute of Mining 
Engineers : U. 8. Northern Boundary Commi isssion; on the Muride, by ELLIOT 
Couves: Birds of the Northwest, by E. Cours: Bu uckley’s Texas Report, 330. 
