April 28, 192 1 J 



NATURE 



287 



plex movements of the air constituting natural wind 

 was below io°, the indications of the different instru- 

 ments were not comparable. Instruments of the 

 Richard type give low figures, whUst the other types 

 give too high readings.— M. Pescara : The results of 

 some recent trials of a helicopter. — P. Painleve : 

 Remarks on the preceding communication. — M. 

 Marage : The evolution of the graphical method. — L. 

 and E. Bloch : The spark spectra of iron and cobalt 

 in the extreme ultra-violet. Tables of the wave- 

 lengths of lines in the extreme ultra-violet are given 

 between the limits A=i845 and 1456. — A. Bigot: 

 Kaolins, clays, and bauxites. Variations of volume 

 under the action of heat. The results with five 

 materials are shown in a diagram. The changes in 

 length of the briquettes were measured for each 100° 

 rise of temperature up to the softening points of the 

 materials.— M. Harlot : The electrical phenomena 

 accompanying the displacement of metals. — M. 

 Ehrmann : An important orogenic movement at the 

 commencement of the Cretaceous period in the Kabylie 

 des Babors. — J. Thoulet : The oceanic circulation and 

 the density of sea-water. The density is rapidly deter- 

 mined by the dipping refractometer and the use of appro, 

 priate tables. — C. Vaurabourg : The density and refrac- 

 tive indices of sea-w^ater. Tables are given showing 

 the relation between the refractive index and density 

 of sea-water for temperatures between 0° C. and 

 30° C. (5° intervals) and for densities ranging from 

 1032 to 1000. — G. Kuhnholtz-Lordat : Dynamical 

 phytogeography of the dunes of the Gulf of Lyons.-— 

 J. Pavillard : Gymnodinium pseudonoctiluca. This 

 rare organism, discovered in 1884 by G. Pouchert, and 

 again in 1890, was abundant in the Gulf of Lyons in 

 1907. It does not appear to be identical with the 

 Gymnodinium found.by Miss M. Lebour at Plymouth. 

 — ^J. Politis : The brown corpuscles causing the brown- 

 ing of the vine. The brown corpuscles are not the 

 cysts of a parasite (Debray) or excretion products 

 (Viala and Sauvageau), but result from a transforma- 

 tion of granular mitochondria. — R. Poisson : Spermato- 

 genesis and the exceptional chromosome in Naucoris 

 maculattis. — A. Paillot : Role of the secretions in the 

 extracellular destruction of micro-organisms in insects. 

 Remarks on a recent communication of MM. 

 Couvreur and Chaovitch. — R. Bayeux : The reducing 

 power of the organic liquids and tissues of some 

 marine animals. An application of the methylene-blue 

 reduction method of H. Roger.— M. Weinberg and L. 

 Kepinow : The leuco-agglutinines. 



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TEURSDAT, Apbil 28. 



KOTAL INSIITTJTIOK OF GBEAI BbITAIX. at 3. .^ , -n J 



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