157 



of chlorides. The sulphnric acid should be of 66° Be., and should 

 not contain iron salts, nitric acid, or hydrochloric acid. The best 

 proportions are: sodium cyanide 1 gm., sulphuric acid 0-8 cc, water 

 3 cc. The optimum temperature for the chemical reaction lies 

 between 65° and 70° C. [149° and 158° F.]. 



Wawrinsky ( — ). Note sur I'Emploi, en Suede, de I'Acide cyan- 

 hydrique dans les Services de I'Hygiene des Habitations. — Bull. 

 Office Internal. d'Hvg. Fiibliqiie, Paris, xiii, no. 5, May 1921, 

 pp. 504-506. 



Since 1918 hydrocyanic acid gas fumigation has been used in over 

 10,000 cases in the" disinfection of dwellings in Stockholm. The 

 methods used are briefly described. 



Roc A (M.). Une Methods pour neutraliser les Vapeurs d'Aeide cyan- 

 hydrique — Bull. Office Internal. d'Hyg. Publique, Paris, xiv, 

 no. 2, February 1922, pp. 124-125. 



Ventilation and aeration should not be the only means rehed on to 

 ehminate hydrocyanic acid gas after fumigation. What is required 

 is a substance that will combine with the remains of the gas and is 

 inoffensive in itself. Hydrocyanic acid acting on aldehydes forms 

 compounds, which when saponified yield an ammoniacal salt that is 

 non-poisonous. This renders the use of the poison very safe and 

 permits of its extensive use. 



LoEWY (J.). Ueber die Mogliehkeit der Ueberwinterung infizierter 

 Malariamticken. [The Possibility of Malaria-infected Mosquitos 

 surviving the Winter.] — Mediz. Klinik, xvii, no. 16, 17th April 

 1921. p. 471. (Abstract in Trop. Dis. Bull., London, xix, no. 4, 

 May 1922, p. 289.) 



In February two infants in Belgrade in a children's asylum developed 

 benign tertian malaria The author states that the possibihty of 

 these cases being relapses can be absolutely excluded and that no one 

 in the asylum was infected with malaria. He therefore concludes 

 that the infection must have been conveyed by mosquitos wintering 

 in the warm rooms of the building and infected in the previous autumn. 



Van Saceghem (R.). La Trypanosomiase au Ruanda. — Ann. Soc. 

 Beige Med. Trop., Brussels, i, no. 3, December 1921, pp. 259-262. 



Of the two pathogenic trypanosomes occurring in Ruanda, 

 T. cazalhoui var. vivax and T. ruandae, the conclusion reached in this 

 paper is that the latter is identical with T. congolense {pecorum) 

 [R.A.E., B, ix, 171 ; x, 50]. 



ScHWETZ (J.). Extrait du Rapport de la Mission m^dicale antitrypano- 

 somique du Kwilu-Kwango, 1920-1921. — Ann. Soc. Beige Med. 

 Trop., Brussels, i, no. 3, December 1921, pp. 339-365, 1 map. 



The Kikwit territory, in the Kwango district, has a mixed forest 

 and savannah vegetation. In the forest near Kikwit Glossina tahani- 

 formis is common, but elsewhere it is more or less rare. The only 

 other tsetse-fly hitherto noticed is G. palpalis, which is extremely 

 rare in the southern part of the territory ; in the other parts it occurs 

 nearly everywhere, but only in very small numbers. As is the case 



