xii 
CONTENTS 
Page 
macldebicescclecleslsie sioca bus soactcen nebo Ueetaeneune cteateseet Ebetssscevecaeae see DOU 
. On Magnetic Double Circular Refraction. By De Wirr B. Braces, Ph.D. 931 
. Determination of the Heliographic Latitude and Longitude of Sun-spots. 
Byabrofessor Al W . THOMSON: .cc.sceceectactee saat cee re cetens cee ene caste meets 931 
WEDNESDAY, SEPTEMBER 16. 
. On the Nature of the Corona of the Sun. By Wirt1am Hvaerns, D.C.L., 
PEAT AINS, SBS ca ves one cece took dk unre edoe yeaea ainsi ok 932 
. On the Spectrum of the Stella Nova visible on the Great Nebula in An- 
dromeda. By Witt1am Hueerns, D.C.L., LL.D., F.RS. ..............0608 935 
. On the Bright Star in the Great Nebula in Andromeda. By RateH 
OOPELAND, IPN... a! casssvessncesceassevsh deceveesew vas Eaccest cateeer ee eee een 935 
. On Solar Spectroscopy in the Infra Red. By Dr. Danret DRapenp......... 936 
. The Errors of Sextants as indicated by the Records of the Verification 
Department of the Kew Observatory, Richmond, Surrey. By G. M. 
WHrepns, BiSei, HReAGS: Ganscdc,:lasacetisabes tices dadeece ae ne eee Reet 936 
. On the Behaviour of First-class Watches whilst undergoing tests in the 
Rating Department of the Kew Observatory, Richmond, Surrey. By G. 
ML Wairere, BSc, BVRLACS. ......3.<c0dsnssneodvudeeeuen tee uate re gE 937 
. On a recent Improvement in the Construction of Instruments graduated 
upon Glass, By G. M. Wiirri, B.8c., FUR.AS, ; .:.3.4ii.. cess eee 937 
- On Methods of preventing Change of Zero of Thermometers by Age. By 
GM. WHIPPLE, Bibi, BORAGE. sasscscs-coveceseovbeissevnededved einen 938 
. On a new and simple form of Calorimeter. By Professor W. F. Barrerr 938 
. On a modification of the Daniell Battery, using Iron as Electropositive 
Bement... By JQ Q0OMRMAM . teliscnecssessasnewiaujincades «nasi<so<snnes aan nie 938 
. On a new form of Galvanometer. By Professor James Bryru, M.A., 
BBB EE. 23. iwse .eiatieg doadduthveda a eta sctsUeetivih odhee st5%8 ved eines ee 939 
. On the Physical Conditions of Water in Estuaries. By Huen Roserr 
Mita, B.Se., ERS, BOB. 03100) cass acierd. «nnd dtevenecudl oes ae 940 
. Further Experiments in Photo-Electricity. By Professor MINCHIN ...... 940 
. On the Formation of a Pure Spectrum by Newton. By G. Grrrrirs, 
AS ocesatesess saboconsaSeentattssesonaesns=ceees sotncondldagares spe iets anne 940 
- On the Use of Bisulphide of Carbon Prisms for cases of Extreme Spectro- 
scopic Dispersion, by Professor C. Prazzt SmyrH; and their Results in 
Gaseous Spectra, commented on by Professor ALEXANDER 8S. HerscHEL, 
My Any BERS. > oct cohs qihloees pavsice wanaicn ne nh thus elses REaee nets ome duis pam es 942 
Srection B.—CHEMICAL SCIENCE. 
THURSDAY, SEPTEMBER 10. 
Address by Professor H. E. Armsrrone, Ph.D., F.R.S., Sec.C.S., President 
ip 
2. 
Of the Sections casececete cach <a cvevesdenvietiedoh tots deb eretebeces. eects ete eee 945 
Report of the Committee appointed for the purpose of investigating by 
means of Photography the Ultra-Violet Spark Spectra emitted by Metallic 
Elements and their combinations under varying conditions ............+.0++- 965 
On the Non-existence of Gaseous Nitrous Anhydride. By Professor 
Wiiiam Ramsay, Ph.D., and J. TUDOR CUNDALL .......cssssccecceccseeons 965 
