January i i, 1906] 



NA TURE 



26- 



fundamental action or condition still remains to be deter- 

 mined. The variable results obtained with the same re- 

 agent under, apparently, the same experimental conditions 

 are pointed out, showing the necessity of averaging a large 

 number of experiments before drawing conclusions. The 

 reagent which has given the best results is made up of 

 searwater, 3 c.c., solution of XaCl of i\ molecules per 

 litre, 45 c.c, distilled water, 72 c.c, sulphite of soda, 

 5 drups. — On the identity of surra and mbori : A. 

 Laveran. It has already been shown that morphologically 

 the trypanosomes of surra and mbori were nearly identical, 

 and also thai animals which had been rendered immune 

 to surra were practically immune to mbori. In the present 

 paper it is shown that an animal which has acquired 

 immunity for mbori is also immune for surra, and hence 

 the conclusion is drawn that the trypanosomes in these 

 two - iseases belong to ihe same species. The trypanosome 

 of mbori is a less virulent variety of Trypan, evansi. 

 — Observations on the sun made at the Observatory of 

 Lynn, with the 1 < . cm. Brunner equatorial during the first 

 quarter of 1005: J. Guiilaume, The results are sum- 

 marised in three tables showing the number of spots, the 

 distribution of the spots in latitude, and the distribution 

 of the facuhie in latitude. — On isothermal surfaces and a 

 class of envelopes of spheres : A. Demoulin. — On some 

 generalisations of Picard's theorem : C. Carat heodory. 

 — On the non-stationary movement of a fluid ellipsoid of 

 revolution which does not change in figure during the 

 movement : W. Stekloff. — On a transformation of certain 

 linear partial differential equations of the second order: 

 J. Clairin. — Reclamation of priority regarding an 

 apparatus of M. Nodon for examining the solar protuber- 

 ances at any time : Antoine Sauve. — On the propagation 

 of light in a system in translation and on the aberration 

 of the stars : G. Sagnac. — On the mechanism of the pro- 

 duction and the nature of kathodic pulverisations : Ch. 

 Maurain. The kathodic pulverisations appear to consist 

 of moderately large particles, torn from the kathode by the 

 shock of the a rays, and charged electrically, but with 

 an e m much smaller than for the projectiles constituting 

 tin kathode rays. — On the mobilities of the ions of saline 

 vapours : G. Moreau. — On the respective spectra of the 

 different phases of the electric spark : G. A. Hemsalech. 

 Using the arrangement of apparatus described in an earlier 

 note, the author finds that the electric discharge gives a 

 line spectrum in non-ionised air and a band spectrum in 

 ionised air. It is shown that a single oscillation is cap- 

 able of producing and rendering luminous the metallic 

 vapour. — The sulphates of samarium : Camille Matignon. 

 The methods of obtaining the acid and basic sulphate from 

 the neutral sulphate are given, together with the properties 

 of these salts. — The action of acetylene on iodine pent- 

 oxide : Georges F. Jaubert. Acetylene is quantitatively 

 oxidised to carbon dioxide by iodine pentoxide at 80° C. 

 In the estimation of carbon monoxide in the air by the 

 iodine pentoxide method, it is therefore necessary to ensure 

 the absence of acetylene by appropriate reagents. — The 

 action of glucose on selenious acid : MM. CEchsner 

 de Coninck and Chauvenet. In the reduction of 

 selenious acid by glucose, a red amorphous colloidal variety 

 of selenium is produced, insoluble in carbon bisulphide. 

 At ioo c C. it is partially converted into black selenium. — 

 I he 11 lion of ammonia gas on the tribromide and triiodide 

 of phosphorus : C. Hugot. A yellow amide of phosphorus 

 is formed by this reaction at low temperatures ; at higher 

 temperatures it is decomposed, phosphorus imide being 

 formed. — On the methods employed by the Arabs to get 

 metallic lustre on enamels : L. Franchet. — On a new- 

 mode of preparation of barium : M. Guntz. The purest 

 metal obtained in previous work contained 98-5 per cent. 

 of barium. If this is converted into the hydride, and the 

 latter heated in vacuo at 1200 C, the sublimed metal is 

 crystallised and of 99-5 per cent, purity. — On some new 

 derivatives of pentabasic phosphoric acid, P(OII).: P. 

 Lemoult. — Syntheses of derivatives of 1:4:7 symmetrical 

 heplanetriol : J. L. Hamonet. — Products of the hvdrogen- 

 ation of carvacrol : Leon Brunei. An account of the 

 results obtained by the application of the Sabatier and 

 Senderens method to carvacrol. — Some liquefying and 

 hycholvsing actions of starch : P. Petit. — On the presence 

 of trachytes and hypersthene andesites in the Carboniferous 



strata of Corsica : M. Deprat. — On Rafhia Ruffia, a wax- 

 producing palm: Henri Jumelle. — On an important vari- 

 ation of the tuber of Solatium Maglia : Eouard Heckel. 

 Experimental work tending to confirm the view of 

 de Candolle that this is the wild species from which the 

 cultivated potato is derived. — On the use of manganese as 

 a manure : Gabriel Bertrand. An account of some ex- 

 periments, made on the agricultural scale, showing the 

 beneficial effect of the addition of manganese sulphate as 

 a manure. — The assimilation of carbon dioxide by the 

 chrysalids of Lepidoptera : Mile. Maria von Linden. — 

 On the parallelism between phototropism and artificial 

 parthenogenesis : Georges Bonn. — On the independence of 

 metamorphosis and the nervous system in batrachians : 

 P. Wintrebert. — On the inoculation of cancer : M. Mayet. 

 The soluble products obtained from a cancerous tumour in 

 man, free from solid matter by filtration through porcelain, 

 and injected into a dog, gave rise to a cancerous growth. 

 — The pathological nature of the Holmgren canals of 

 nerve cells : R. Legendre. The author's views are in 

 direct opposition to those of Holmgren concerning the func- 

 tion of the cavities in nerve cells, and he regards them 

 as pathological in nature. — On the discovery of Amphibia 

 in the Coal-measures of Commentry : Armand Thevenin. 

 -Magnetic observations at the Observatory of Ebre on 

 the occasion of the eclipse of the sun of August 30, 1905 : 

 P. Cirera. 



January 2. — M. II. Poincare in the chair. — On the 

 estimation of carbon monoxide in air by iodic anhydride : 

 Armand Gautier. With reference to the note by M. G. 

 Jaubert in the last number of the Comptes rendus, the 

 author points out that he published this fact in 1898, 

 and has also shown how to correct for the error 

 introduced into the determination by the presence of 

 acetylene. Acetylene does not occur in the air of towns. 

 — New observations on the Pycnogonides collected in the 

 Antarctic regions in the course of the expedition directed 

 by M. Jean Charcot : E. L. Bouvier. — On the deformation 

 of quadrics : C. Guichard. — On the mutations of some 

 fossil plants of the Coal-measures : M. Grand'Eury. A 

 r&sumi of the results obtained by the author during 

 the last ten years. — Observations of Giacobini's comet 

 (1905c) made at the Observatory of Toulouse with the 

 38 cm. Brunner-Henry equatorial : F. Rossard. Observ- 

 ations made on December 18 and 22, 1905, showing 

 the positions of the comparison stars and apparent posi- 

 tions of the comet. — Provisional elements of Giacobini's 

 comet (1905, December 6) : E. Maubant. — Observation of 

 Giacobini's comet (1905c) made with the 16 cm. Brunner 

 equatorial at the Observatory of Lyons: J. Guiilaume. 

 Observations made on December 12, 1905. The comet 

 appeared as a diffuse luminosity of 30" to 40" diameter. 

 — Photographic study of the annular nebula in Cygnus, 

 N.G.C. 6894 : Gabriel Tikhoff. The details shown by the 

 photograph are in general agreement with those published 

 by Keeler, from the Lick Observatory. — Theorem on entire 

 functions : M. Auric. — A contribution to the study of 

 photographic screens: J. Renaux. Remarks on the use 

 of colouring matters for photographic screens. — Researches 

 on the terrestrial field, carried out during the total eclipse 

 of August 30, 1905 : Charles Nordmann. — On the deter- 

 mination of the rare gases in natural gaseous mixtures : 

 Charles Moureu. A diagram of the scheme of apparatus 

 used by the author is given, together with exact details 

 of working. Oxygen and nitrogen are removed by hot 

 lime and magnesium mixture, hydrogen and hydro- 

 carbons by heated copper oxide, moisture and carbon 

 dioxide by phosphoric anhydride and soda lime respec- 

 tively. The last traces of nitrogen are removed by metallic 

 calcium. — On the heat of fusion of ice : A. Leduc (see 

 p. 254). — On the synthesis of the amido-acids derived from 

 the albumens : L. Hugounenq and A. Morel. — The struc- 

 ture of plants developed in the light, without carbon 

 dioxide, and in presence of organic materials : M. 

 Molliard. The essential characters of plants cultivated 

 under the above conditions are a structure resembling that 

 of the subterranean organs and the formation of tissue 

 with plurinucleated cells. — Symbiosis of orchids and 

 several endophytic fungi : Noel Bernard. — On the cope- 

 pods collected by the Charcot expedition and communicated 

 by M. E. L. Bouvier : M. Quidor. — On a new micro- 



NO. I. 



VOL. Jl 



