NovEMBER 20, 1913] 
NATURE 305 
chef for any continuous function.—E. Goursat : Some 
singular integral equations.—R, Boulouch: Homo- 
graphical relations between systems of centred 
spherical dioptres. Singular stigmatic points.—Emile 
Baud: Relation between the heat of formation of 
binary liquid mixtures and their composition. For 
mixtures of cyclohexane and ethylene bromide the 
relation g=kx(1—x) is shown to hold good, in which 
q is the quantity of heat evolved, x and (1—x) are |, planatiGn' Ge Sheet oz: 
| and Petrological Notes by Dr. J. J. H. Teall. Pp, 
the fractions of the gram-molecule of each consti- 
tuent for a gram-molecule of the mixture. k varies 
only from 1-30 to 4-35.—L. C. Maillard : The origin 
of the cyclic bases of coal tar. Amino-acids combine 
with sugars giving humus bodies which yield pyridine 
bases on dry distillation. These facts are applied to 
the formation of coal and to explain the products of 
its pyrogenic decomposition.—Marcel Sommelet - A 
mode of decomposition of the halogen alkylates of 
hexamethylene-tetramine. An aqueous solution of 
the chlorbenzylate of hexamethylene-tetramine when 
boiled gives benzaldehyde as the main product of its 
decomposition. The homologous toluic aldehydes are 
formed in a similar manner. The course of the 
reaction cannot be readily followed.—C. Gaudefroy : 
The dehydration figures of potassium oxalate.—G. 
André: The displacement of potassium contained in 
certain felspathic rocks by some substances employed 
as manure. Various salts, triturated in aqueous solu- 
tion with felspar, bring into solution notably larger 
quantities of potassium than would be obtained with 
Water alone, ammonium sulphate, and calcium acid 
phosphate producing the greatest effect.—A, Maublanc | 
and E. Rangel: Stilbum flavidum, a Parasite of the 
coffee plant, and its place in classification.—G. 
Barthelat: The fruit of Mesembryanthemum and its 
dehiscence.—P, Chaussé: The determination of the 
minimum infectious dose in tuberculosis by inhala- 
ticn.—C. Levaditi: Presence of the treponeme in the 
blood in general paralysis. The living organism was 
definitely proved to be circulating in the blood of 
patients suffering from general paralysis. The blood 
in these cases gave a positive Wassermann reaction.— 
Y. Manouélian: The existence of Negri’s corpuscles 
in the nerve ganglia of the salivary glands in animals 
Sections of the salivary glands 
showed large numbers of Negri’s corpuscles in the 
cytoplasm of the nerve cells only ; no other constituent 
of these glands showed the corpuscles.—Maxime 
Ménard: A certain means of avoiding Réntgen-ray 
burns. A description of special screens and gaunt- 
lets, together with a proof of the real immunity from 
‘-ray burns obtained by their use.—M. Dantan: The 
edulis.—A, Trillat and M. 
Fouassier: The conditions of 
materials.—Sabba 
Stefanescu : The ramification of the dental tubercles of 
the molars of Elephas, Stegodon, and Mastodon. 
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