are Ebert and C. Le Morvan. A description of the modifications found necessary in the original apparatus, by means of which the error of a single point is less than 0.obs. The results are obviously free from personal error, and the deformations produced by the objective eliminated, since the images of the stars and the slit fixing the meridian, being produced by the same lens, undergo the same deviations.-The rigorous determination of two instrumental constants which intervene in certain meridian observations: H. Renan. A method for determining the exact angular relations between the two cross wires of the micrometer and the plane of the telescope.-The arbitrary character of developments of solutions, even unique, of the problems of mathematical physics, and on new properties of generalised trigonometrical series: A. Buhl. Measurements of wave-lengths in the iron spectrum for the establishment of a system of spectroscopic standards : Ch. Fabry and H. Buisson. The measurements were made photographically by the interference method, the green mercury line given by the Cooper-Hewitt lamp being used as a basis. The measurements given fall between XX 3606-687 and 6494-994.—The photography of the infrared rays: Walter Ritz. The author has subjected Abney's method of preparing sensitive collodion films to a critical examination, and gives details for the preparation of plates highly sensitive to the infra-red radiations. Photographs were taken of the spectrum from the blue decreasing regularly to 14, none of the discontinuities inseparable from the use of colouring materials being apparent.—The reduction of molybdenum dioxide by boron, and the combination of boron with molybdenum: Binet du Jassoneix. Previous work on this subject has been vitiated by the use of carbon crucibles, the formation of carbides of molybdenum being unavoidable under these conditions. The author uses a magnesia boat, and readily obtains pure molybdenum by heating boron and molybdenum dioxide in the electric furnace. By increasing the proportion of boron, products, free from carbide, and containing up to 46 per cent. of boron, can be prepared. These are attacked by dilute nitric acid, and show no trace of crystalline structure. The electrical conductivity of colloidal ferric chloride G. Malfitano. The influence of non-electrolytes on the mutual precipitation of colloids of opposite electrical sign: J. Larguier des Bancels.-The composition of an acetic ferment: E. Alilaire. Five grams of a very active mycoderma were obtained from a vinegar works, the conditions allowing of the production of a pure culture on the large scale. Alcohol extracted 1.56 per cent. of a fatty substance containing phosphorus, from which, after saponification with soda, potassium iodide gave iodocholine crystals. The substance thus freed from fat contained 6.9 per cent. of nitrogen and 5.9 per cent. of ash, the analysis of which is given. The presence of a considerable proportion of iron and copper in the ash is noteworthy, the latter metal, according to the author's views, playing an important part in the process of acetification. -The microlitic rocks collected in Grahamsland by Dr. Charcot's Antarctic Expedition: Ernest Gourdon.-The presence of neon amongst the gases from some hot springs : Charles Moureu and Robert Biquard. Previous notes published on the gases from twenty-two hot springs have shown the general presence of argon and helium. A direct examination of these gases for neon gave negative results, owing to the fact that the neon spectrum is completely masked by argon. By the application of the selective absorption of charcoal cooled to -100° C., neon was proved to be present in every case.-The cyanogenetic principles of Phaseolus lunatus: M. Kohn-Abrest. The estimation of malic acid and some fixed acids in the juices of fruits, fermented or unfermented: W. Mestrezat. The method is based on the insolubility of barium malate, tartrate, and succinate in dilute alcohol.-The phosphohumic compounds of soil: J. Dumont.-Remarks concerning the artificial development of Ascaris vitulorum: L. Jammes and A. Martin.--The histological composition of the lymph of ruminants: E. Forgeot.--The pigmentation of hair and beard by the X-rays: A. Imbert and H. Marquès. Light hair darkens under the action of the X-rays. The geology between Zinder and Tchad : René Chudeau. CALCUTTA. Asiatic Society of Bengal, July 4.-Some freshwater Entomostraca in the collection of the Indian Museum Calcutta R. Gurney. An account of the freshwater phyllopods, cladocera, and copepods in the collection of the Indian Museum. Fourteen species new to the Indian fauna are recorded; new species of Daphnia and Estheria, and a new variety of a Streptocephalus are described.-Preliminary note on the chemical examination of the milk and butter-fat of the Indian buffalo: E. R. Watson. Pappel and Richmond found that the milk of the Egyptian buffalo contains no lactose, but a different sugar that they name tewfikose. This is not the case with the milk of the Indian buffalo, which contains lactose. In the butter-fat the Indian buffalo's milk proves to contain more butyric acid than either the European cow or the Egyptian buffalo and also apparently more palmitic or stearic acid.-A new gecko from the eastern Himalayas: Dr. N. Annandale. A description of a new form of Gymnodactylus closely allied to the Malayan G. marmoratus.-Freshwater fauna of India, No. viii., some Himalayan tadpoles: Dr. N. Annandale. The larva of Bufo humalayanus and Rana liebigii are described, and that of Megalophrys montana is recorded from the Darjeeling district. Notes are given on the different ways in which different tadpoles which inhabit mountain torrents in the Himalayas are protected against sudden floods.-A parasite upon a parasite. A Viscumapparently I'. articulatum-on Loranthus vestitus 00 Quercus incana: I. H. Burkill. The paper gives an account of the double parasitism recorded in the title together with a review of the geographical distribution of such double parasitism and the names of the associated plants in recorded cases.-Gentianacearum species Asiaticas novas descripsit I. H. Burkill. Diagnoses of new species of the genera Gentiana and Swertia from Asia.-Swertiam novam Japonicam ex affinitate Swertia tetraptera, Maxim. descripserunt S. le M. Moore and 1. H. Burkill. Diagnosis of a new Swertia from Japan. NOW READY. 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The telegraphic address of NATURE is PHUSIS," LONDON. I 10 6 *Three Lines in Column. Per Line after. £ s. d. 6 2 O 15 6 o 8 о O о 9 One Sixteenth Page, or Eighth Col. 10 0 One Eighth Page, or Quarter Column 0 18 6 £ s. d. Quarter Page, or Half a Column 1 15 O Half a Page, or a Column 3 G 5 Whole Page. 6 6 . * The first line being in heavy type is charged for as Two Lines. TOP. The NEW RAPID THE CAIFFE AUTO-MOTOR NO BRUSHES, NO BANDS, NO INDEPENDENT MOTOR. The interruption cuts the current both for motor and coil. In other words motor and interrupter are electrically and mechanically linked together. Kuns 500 working hours without requiring attention. See NATURE, July 20, 1905. page 277. The leading experts have reported in terms of the highest praise upon this Break after continuous use (ride Testimonials) Price, including box and packing. £4: 6:6 THE MEDICAL SUPPLY ASSOCIATION, 228 Gray's Inn Road, London, w.c. Descriptive Circular upon application. MERCURY INTERRUPTER. A break comprising all the latest improvements with a simple and reliable method of raising and lowering the mercury. Fitted with first-class motor of any voltage up to 250. Requires only 2 lbs. of mercury, and is simplicity itself for cleaning. The "CALDWELL" ELECTROLYTIC INTERRUPTER. Will work on direct or alternating circuits from 50-250 volts without interposing any resistance. Current adjusted by rack and pinion movemen', giving perf. ct regulation with any tube. No expensive platinum parts to replace. Price £3 10 : 0 THE CELEBRATED DALLMEYER LENSES. (These Attachments can be fitted to any good Lens.) Printed by RICHARD CLAY AND SONS, LIMITED, at 7 & 8 bread Street Hill, Queen Victoria Street, in the City of London, and published by MACMILLAN |