CONTENTS. 
NUMBER CXXXVIII. Be 
ag 
Arr. XLIX.—Respiration of Plants; by W. P. Witson,--- 423 
L.—On the Question of Electrification by Evaporation ; by : 
LL—Observations on Snow and Ice under eesti at tem- 
peratures below 32° F.; by E. Hunarrrorp, ---- ------ 434 
LIL—On the minerals, mainly Zeolites, Sontag in the 
basalt. of Table Mountain, near Golden , Colorado; by 
eA MOH AN We PILL RBBAWD, 20.0... ..2..+---- 452 
D, 
LITI.—On a new Locality for Hayesine; by N. H. Darron, 458 
LIV.—Notes on ane: Electromagnetic Theory of Light, I; 
Te Ne se ek ky ne e+ 
LV.—New Phyllopod oe from the Devonian e 
New York; by J. Crarke. (With a Plate), ---- -- 476 
LVL—An Organ-Pipe Serre : by W. LeConte Stevens, 479 
SCIENTIFIC INTELLIGENCE. 
Chemistry and Physics—New apparatus for determining ae points, Cease 
and BEVAN, 482. ari tical Temperatures of Organic Liquids, PAWLEWSKI: New 
tg Sulphobrom ide, HELL and UrecH, 483.—New ater se 
ysical Properties a Carbon Oxysulphide, Thosvay, 484.—Form mation 
of. Metallic Alloys by Pressure, Spr Symmetrical Chlor- ethyl oxide, 
HANRIOT, 485 6.—- Constitution a Riaeonaa The PP and Ges tepetio Preparation 
of lizarin-orange, songs otometric Investigation, E. KeTeLer and 0. 
Puurricy, 486.—Theo eg elite double Refraction, E. Lome: Differ- 
ence of Potential hebeeon a Metal and Fluids of different concentration, E. 
Kirtiter: Electrical Resistance oe a Vacsim, i Eptunp: Solar Heat, M. A. 
Crova, 487.—Aconitic acid, from Sorghum Juices, H. B. Parsons, 488. 
Geology and Natural History.—The Climatic Changes of later Geological Times, 
J. D. Wurtney, 489.—Third Appendix to the Fifth Edition ‘of sae 3 System 
of Mineralogy, E. S. Dana: The Genus Wolnctlipors, 8. A. MILLER: Handbook 
_ of Invertebrate Zoology for La seorvon Bex s and Seaside Work, W. es BROOKS: 
bsorption of lg oxides bol nts, P. ©. Putiuips, 491.—Monographie des 
Composées, H. BAILLON: Guide Bisco Pere of Washington and vicinity, L. F. 
WARD. , 499. Les Mailers Bles, "eb. ORIN-ANDRIEUX: ust pr Matters 
in Plants, Dr VRIES, —A Po pular cari Flora, V. Ratt 
Miscellaneous Scientific Tels Aecas cal Observations fae her at the ! 
U.S. N. Observatory: American Assoc rr 495.—Norton’s Astronomy, 496. 
i —Sir Charles Wyville Senet 496.—General ces G. Barnard: 
Charles M. ‘Wheatley : William S. Vaux 
ERRATA. 
Page oes = 18 for, at the disk, read, at he eee of the disk. 
Page 30, for J. I. LeConte read J. J. LeCon 
Page 35, = line from bottom, for beaten pate remaining. 
Page 37, 3d line of continued note, for different read tea 
Page 248, line 40, for John M. Cooke, read John M. ©. 
2 
Page 281, the expression in line 15 from top should read: u’+ u’”—— (B—A)- 
Page 349, the words Jeff and right in lines 15 and 17 respectively should be 
exchanged. 
Page 399, the expression above Eq.’7 should read: = (no tani — tan r) sin 7. 
_ Page 400, the expression after or, should read: no cosi — ncos7. 
