424 



NA TURE 



Feb. -8, i! 



persons and seven animals irjuied, hy lightning. — Report on the 

 solar spots and facula; observed at Kome during Ibe year 1S83, 

 by M. P. Taccliini. The paper is accompanied hy a lahle of 

 dates, relative size, frequency, and numher of the spots. — Obser- 

 vations on the Pons-Broolis comet at the Observatory of Nice, 

 one illustration, by M. Perrotin. — Note on the appearance 

 of the same comet on January 13 and 19, 1884, by M. Perrotin. 

 — On the sudden modifications of form (wings, egrets, &c. ), 

 presented by the same comet during its passage through peri- 

 helion, by M. G. Rayet. — On the barometric disturbances 

 caused by the Kraliatoa eruption, as recorded by the Redier 

 barometer of the Observatory of Toulouse, by .M. Baillnud. 

 — On linear substitutions (niaihematical analys's), by M. II. 

 Poincare. — Generalisation of J.icobi's theorem on the Hamiltf n 

 equations, by M. J. Farkas. — On curves of the fourth order, by 

 M. C. Le Paije. — On the propagation of li^ht in a crystallised 

 medium, by Madame Sophie Kowalevski. — On the distribu- 

 tion of potential in a liquid mass having the form of an indefinite 

 recangnlar prism, by MM. AppcU and Chervet. — On joule's 

 electric law, by M. 1'. Gavbe. — On the electric conductibihty of 

 greatly diluted saline solution«, by M. E. Bouty. — Note on 

 several unsuccessful attempts recently made to liquefy hydi'ogen, 

 by M. K. Olszewski, ^he^e ex(eriuients are reporteu incon- 

 sequence ofM. Wroblewski's statement that he has succeeded 

 in liquefying hydrogen by exyansion at a temperature of 

 - 186° C. by means of boiling hydrogen. — On a gas-burner 

 yielding a white light by the incandescence of magnesia, by M. 

 Ch. Clamond. — On the law of the thermic cons'ants of sub- 

 stitution (thermo-chemistry), by M. D. Tommasi. — On the 

 formation of the iodide of methyl and of the iodide of methylene 

 by means of iodoform, by M. P. Cazeneuve. — Note on the 

 moirobromic methylchloroform CCI3 - CHnBr, by M. L. Henry. 

 ^On the albuminoid substances contained in milk, especially 

 caseine, by M. E. Duclaux. --Fresh observations on the 

 morphology, anatomy, and development of the parasites of the 

 onion and other bulbous plants (Tyleiichus hyacinthi, Tylcnchns 

 initre/acutis^ &c.), by M. Joannes Chatin. — Remarks on the 

 preparation of farmyard manure, by M. P. P. Deherain. — On 

 the presence of pegmatite in the diamantiferous sands of .South 

 Africa ; observations in connection with M. Chaper's recent 

 communication en the subject, by M. Stan. Meuniei". — On some 

 freshwater formations during the old and recent Quaternai-y 

 periods, by M. Ph. Thomas. — On the arched waterspouts of the 

 Indian Ocean (two illustrations), by M. Le Goarant de Trome- 

 Im. — Note on the particles of dust found in the snow that fell 

 at Stockholm last December, by M. E. Vung. — Actinometric 

 observations made at Montpellier during the year 18S3, by M. 

 A. Crova. 



February 18. — M. Rolland in the chair. — Observations of the 

 small planets made with the large meridian at the Observatory 

 of Paris during the third and fourth quarters of the year 18S3, 

 communicated by M. Mouchez.— On the reciprocal displace- 

 ments between fluorhydric and the other acid.s, by MM. lierlhe- 

 lot and Guntz. — On the law of modules or thermic constants of 

 substitution, by M. Berthelot. — Remarks on a note by M. |. 

 Luvini in connection with the controversies carried on in the 

 eighteenth century on the subject of waterspouts and whirlwinds, 

 by M. Faye. — Determination of the difference of longitude be- 

 tween Paris and the Observatory of Bordeaux, by MM. G. R.ayet 

 and Salats. The longitude of the meridian of the Bordeaux 

 Observatory, as here rectified, is fixed at iim. 26 •444s. ± 

 o'ooSs. — Remarks in connection with the recent researches 

 made on the propagation of the atmospheric currents caused 

 by the eruptions of Krakatoa, by M. F'oerster. The author 

 disclaims priority for the observations made by him on 

 this phenomenon, a priority which he awards to General 

 Strachey, whose paper on the subject appeared in a recent 

 number of Nature (p. 181). — On the divisors of certain 

 polynomes, and on the existence of certain primary numbers, by 

 M. A. Genocchi. — On the composition of such polynomes as 

 admit only of primary divisors of a determined form, by 

 M. Lefebure. — On certain linear substitutions (mathematical 

 analysis), by M. E. Picard. — On an equation of the tn degree, 

 which has never more than two real roots, by M. D. Andre. — On 

 a differential equation of the third order, by M. E. Goursat. — On 

 M. Levy's elastic curve, expressing the equilibrinm of an elastic 

 circular rod subjected to normal and uniform pressure through- 

 out its whole length, by M. IIal|jhen. — On the adiabatic expan- 

 sion of the vapour of w ater, by M. Paul Charpentier. — Researches 

 on the flucrhydrate of fluoride of potassium, and on its states of 



equilibrium in various solutions, by M. Guntz. — On the nitrous 

 derivatives of hydride of ethylene, by M. A. Villicrs. — On the 

 probable number of homologous and isomerous rosanilines, by 

 MM. A. Rosenstiehland M. Gerber. — On a new compound arising 

 from the preparation of the hexachloride of benzine, having the 

 same centesimal composition as that substance, by M. I. Meunier. 

 — On the constitution of niilk, by M. E. Duclaux. The author 

 reduces milk by a new method of analysis to the following 

 elements : — 



In suspension In solution 



Fatty substance 3 '32 ... — 



Sugar of milk — ... 4-98 



Caseine ^"^^ ■■■ c'84 



Phosphate of lime o'22 ... 0"I4 



Soluble salts — ... 0-39 



67s 6-35 



— On the pigmentary function in the Flirudinere (common leech. 

 Nephelis, Aidostoma vorax, &c.), by M. Rt'my .Saint-Loup. — 

 On the physiological development of the adult Comatule, by 

 M. Edm. Pen'itr. — On a placenfoid organ in the embryo ol 

 birds, by M. Mathias Duval. — Origin and mode of formation .if 

 the Belgian Devi n an and Carboniferous limestones, by M. E. 

 Dupoiit. The aurhor explains the formation of the older marine 

 rocks of organic origin by iau«es still in operation, and from 

 this deduces afresh proof of the value of the comparative method 

 applied to the study < f the past geological history of the globe. 

 — On the variability of the composition and concentration of 

 mineral waters, by M. A. Inostranzeff. 



CONTENTS PAGE 



The German Cholera Commission 401 



Schopenhauer. By Prof. Andrew Seth 402 



Our Book Shelf:— 



De Lapparent's " Conrs de Mineralogie '' .... 403 

 Letters to the Editor ; — 



The Rem.arkable Sunsets. — Prof. John Le Conte ; 



Prof. G. H. Stone 403 



"Probable Nature of the Internal Symmetry of 



Crystals." — ^A^m. Barlow 404 



" Mental Evolution in Animals." — George J. Ro- 

 manes, F.R.S 404 



Instinct. — Prof. C, Lloyd Morgan 405 



Protection by Mimicry — A Problem in Mathematical 

 Zoology. — Capt. Thomas Blakiston and 



Thomas Alexander 405 



Christian Conrad Sprengel. — Prof. K. Mbbius . . 406 

 Circular Cloud Bows. — E. H. L. Firmstone . . . 406 

 On the Absence of Earthworms from the Prairies of 

 the Can.adian North-West. — Timothy E. Wilcox 406 

 Zoological Results of the Work of the United 

 States Fish Commission in 1883. By Ralph S. 



Tarr 407 



African Spiders 40S 



Mr. Burnham's Double-Star Measures 409 



Measuring the Aurora Borealis. By Dr. Sophus 



Tromholt ( With Diaginms] 409 



Count du Moncel 412 



Notes 413 



Our Astronomical Column : — 



The .Solar Eclipse of 1S06, December 10 415 



The Late Prof. Klinkerfues 415 



Geographical Notes 415 



On the Phenomena exhibited by Dusty Air in the 

 Neighbourhood of Strongly Illuminated Bodies. 

 By Profs. Oliver J. Lodge and J. W. Clark ... 417 



Agates. By Prof. M. Forster Heddle 419 



The Origin of the Scenery of the British Islands. 

 By Archibald Geikie, F.R.S. , Director-General of 

 the Geological Survey of the United Kingdom .... 419 

 Sun Glows and Volcanic Eruptions in Iceland. By 



Dr. Sophus Tromholt 420 



Composite Portraiture adapted to the Reduction 

 of Meteorological and other Similar Observa- 

 tions. By G. M. Whipple, B.Sc, F.R.Met.Soc., 

 F.R.A.S., Superintendent of the Kew Obseriatory 420 



University and Educational Intelligence 421 



Scientific Serials 421 



Societies and Academies 422 



