vi CONTENTS. 
NUMBER XLVII.—APRIL. 
Page 
Mr. J. de C. Sowerby’s Observations upon the Habits of the 
Plecotus auritus, or Long-eared Bat.............-0+04. 265 
Mr. G. Schweitzer’s Observations on the frequent Presence of 
Lead in English Chemical Preparations; on the Cause of 
that Presence; and other Remarks relative thereto ...... 267 
Mr. J. Tovey’s further Researches in the Undulatory Theory 
GP gtr: & .y..c'< nies shee cian te eee eedesaiay nis ea Tels ieee 
Mr. W. Hopkins’s Abstract of a Memoir on Physical Geology; 
with an further Exposition of certain Points connected with 
270 
GE SGD Ct, nae ey aracd SER eae eaiels = jake a eae 272 
Mr. J. T. Graves on the lately proposed Logarithms of Unity, 
in. Reply.to Prof De Morgan... 5 oc 6.4.2 00 n> % ani balmiee 281 
Rev. Prof. Challis on the Phenomena of Drops of Oil floating 
TL LAT 1 RES ET oan rh Sema er ys Caries” - 288 
Mr. P. Barlow’s Remarks on Lieutenant Lecount’s Treatise on 
PEGI AR AMUAS 2 00 Sha, ots chokes Sie ty ainsait Sky of a ain Syord Bele Lee 291 
Mr. T. Squire on the Solar Eclipse of May 15th, 1836, parti- 
cularly as it will be seen at Alnwick, in Northumberland .. 293 
Prof. J. R. Young’s Observations upon Mr. Woolhouse’s Theory 
Of Wena SP LACtGNS We. hie fannie, 9 sg hh ssa: crete See 295 
Mr. C. Fox on the Construction of Skew Arches .......... 299 
Rev. Baden Powell’s further Observations on M. Cauchy’s 
Theory of the Dispersion of Light.................... 305 
Proceedings of the Geological Society, (Anniversary Address 
of Charles Lyell, Esq. President) ...........000...0000: 310 
——___—__—_——_ Linnean Society; Zoological Society 345-346 
——— at the Meetings of the Royal Institution ...... 348 
On the Attractive and Repulsive Forces of Magnets at very 
BIMAL AVISEANEES 2 < widis wois ayrinyesk stir = 40 ci tiecaper ee inten thet oe 349 
On the Aurora of the 18th November last ..............,. 350 
Note on Mr. Atkinson’s Paper inserted in the last Number of 
our Journal mage NSB oe. to n.< st-\m.nssisielaposave esleltS/ctee ie Cer rope | 
Meteotological Observations, . . ....0).(..2.66 se jee 91900 2 80 351 
NUMBER XLVIII.—MAY. 
Dr. R. Kane on the Action of Hydrochloric Acid on certain 
Sulphates, and particularly on the Sulphate of Copper.... 353 
Mr. W. Hopkins’s Abstract of a Memoir on Physical Geology; 
with a further Exposition of certain Points connected with 
the Subject (continued)........... steaiats. sated perl 9 ea 357 
Sir Philip de Malpas Grey Egerton’s Catalogue of Fossil Fish 
in the Collections of Lord Cole and Sir Philip Grey Egerton, 
arranged alphabetically; with References to the Localities, 
Geological Positions, and published Descriptions of the 
SUE R  awe cas aU IEE Piles te rtm. ys. tle hee ta 366 
Mr. C. Rumker on a new Method of reducing Lunar Obser- 
vations for the Determination of the Longitude,......... 373 
