vill CONTENTS. 
XLI-—On the Periodicity of the Rainfall in the United 
States in relation to the Periodicity of the Solar Spots ; a 
by Jonn Brockuessy. - aoe 439 
XLII—On Serpentine Pseudomorphs, and other kinds, “from 
the Tilly Foster Iron Mine, Putnam Co., New York ; 
by James D. Dana. With plates VI and VIL_....._- 447 
XLII —On the age of the Lignitic sais of the | 
Mountain region; by F. B. Merx.._._._-......2-.. 22. 
SCIENTIFIC INTELLIGENCE. 
C and Physics—Magnetic Equivalent of Heat, M. Cazin, 463. Etcorg 
eral ocala A. Scuuster, 464.—Specific Heat of Gases , WIEDEMANN, 465. | 
Geology and Natural History.—Coral reefs is Hawaii: Drift in Kansas, ar 'v. = q 
Kwox, 466.—Note on the sarighrrect Volcanoes, T. Coan: Permian in e Nov 
e : Se 
Survey of the Territories for 1873, F. AYDEN, 467.—( berg: of Plants 
collected i st — years 1871, 1872 and 1873, 468 —On the Use of closi 
America, 469.—Notice of Pa apers on Embryology by A. Kowalevsky, a re 
AGASSIZ, Bee —Embryology of the Ouenephoee. by ALEXANDER Agassiz, 471.— 
Development of Marine Sponges, 476 
mer sas —On the apparent connection between Sun-spot and Atmospheric 
Ozone, by T. Morrat, 477. e 
Miscellaneous Scientific Intelligence—Permanent Ice in a Mine in the Rocky Moun- ‘3 
tains, by R. WEISER, 477.—Franz-Joseph Land: Physiology, ge fae FOSTER : 
The Transit of Venus, by GEORGE Forbes: Swedish Iron Ores, 4 
ERRATA. 
Page 82, line 7 from bottom, Jor =“ aon times. 
i. 
at 88, sc : “ T3 
~ 8 eS: ee “t see * on next page. ¥ 
Mee do top, rs + on preceding page. : 
roe ee tbo sue tion sound, read direction of so o 
oa) ee —_— after assume, read (as I did when I aes mie *) 4 
*- 100, lines 2 and 9 ete ae top, for ep ga — Johnston. 
_ 104, line : from top, for vertib po one tibuli. 
* 169 for UT, read UT;. 
- 173, e : = bottom, for Hs read tad fo or, 
bas 174, 5s for exi sting read exciting. 
ein, ~ 4 “ top, for (7.) reads 
718, “ 1 © bottom, read RB oti curve; formed by combining the 
curve of a musical n te with that of its octave. hpepyed 
correction to te hen, to be applied to figs. 5 an 
at 180, “ ] “ aga (8.) yt : 
«136 61 tan. for reduced read reversed. 
“ 199, 101. from top, for nitroso-nitro-chloride read chloro-nitrate. : 
“ 200, 21 1. from top, read lost. | 
s 222) ae from om 06 for one ‘read tw 
# 367, -5 1. from gh fount ena Co read oc. 
