CONTENTS. 
Ligut ann Heat. 
Dr. C. K. Axrn’s Account of Preliminary Experiments on Calcescence...... 
Mr. A. CLauDET on some Phenomena produced by the Refractive Power of 
iLLy LOT. 2a SRR bist 2 RP ces dot se Gee pCr CoD on Bim RO ee PDe sic aaie 
Dr. J. H. Guapstone and Rey. T. P. Daxe on Specific Refractive Energy . . 
Mr. W. Lapp on a New Form of, Syren. 0) 0's, sje <0 os soul pein cveeeeeees 
M. SoxEm’s Tenebroscope, for illustrating the Invisibility of Light. (Exhi- 
bited and described by the Abbé MOIGNO.)..........eseceeeneeseeceees 
M. Sorem on a New Micrometer. (Exhibited and explained by the Abbé 
MORRRES ORIENT SS j0e OEE yea sot oa sins, v0 a a,< aigea dl ans! sie raat edie ara diane Re eae 
Professor Puickur on Spectral Analysis... ......cccncncseccnsescevnce 
Mr. Barnarp 8. Proctor on the Focal Adjustment of the Eye .......... 
Mr. H. Swan on a new kind of Miniature possessing apparent Solidity by 
ean GT se Combi etn Of PTISMAS: sar. a jauce.e ox «wy ald a WP « ididveyninialaiarets a0.8 0/0 
Exectricity, MaGnerism. 
Mr. W. Coox on Bonelli’s Printing Telegraph ........c..ceeeeeeeeceees 
Mr D> H. Hoaues ona Printing Telegraph 065.000 cers e cies oie siereeg ats om 
mr.  W. Lapp on an Acoustic Telegraph... .. 00.4 jne01ee sce dd bipviae ae as bate 
— on an Electromotive Engine.........c. sees nsec ne cece eens 
M. Oupry on Galvanic Copper and its Applications. (Communicated by the 
PaMiALIAEIUCSECEN (DG) tala hs faces. > ala SRC aiavhs, Zia, ¢.a.0, See APC © nates ccka 9 cect 9 «UR 
Specimens of Telegraphic Facsimiles, produced by Caselli’s Method. (Ex- 
hibited and explained by the Abbé MOIGNO.) ....... ccc cece cence nes 
Merrorooey, ETC. 
Professor Buys-BaLLor on the System of Forecasting the Weather pursued 
IEE Pr nieriar sn ssc cle tamed s Cure en Sac tetas ejdaw tiie ates 
Professor CHEVALLIER’s Description of an Instrument for ascertaining the 
peeaneh aeGlioted air Sas, SUES te: US a ee, Soa eee Pn eeN lime coke 
Eee Corriy on the Path of a Meteoric Fireball relatively to the Earth’s 
MEDEA» No -tidd) At DbLTAD Aes). Doe. Pe wea ODOT AE 
DEE reataArnrors or Pope sei) os. Perea, ee ae 
Mr. E; J. Lowx'on Ozone and Ozone Tests ..........cccceccccccccscccs 
Dr. Morrar on the Connexion that exists between Admiral FitzRoy’s “ Cau- 
tion Telegrams ” and the Luminosity of Phosphorus ...............05- 
Abbé Jeannon’s Free Air Barometer and Thermometer, exhibited and ex- 
RE ine “MHERT WEOTONO Once. cose res vee ee roe ke ce ee 
M. Navupet’s Metallic or Holosteric Barometer, exhibited and explained by 
Re PAneenUNGrhns ts hacr irises cs ie eh rs ees sss eet eae ey ge Fe 
Rey. THomas Ranxrn’s Meteorological Observations recorded at Huggate, 
Workshire Yercisews. bias. aoxrioes c 
Mr. H. Scutagintwetr on a new Revolving Scale for Measuring Curved Lines 
i 
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