134 



have each a strong insecticidal action, that of iodoform being feeble. 

 Naphthahne appears to be the most suitable basis for use in the prepara- 

 tion of a powder destructive to lice. Commercial naphthaline is more 

 actively insecticidal than pure naphthaline, and its lethal power is 

 dependent in great part on the presence of hydrocarbons and coal-tar 

 derivatives other than pure naphthaline. The immediate lethal effect 

 of creosote when mixed with naphthaline is less than that of some other 

 insecticidal liquids, but the longer period during which creosote 

 continues to act more than compensates for the initial disadvantage. 

 In addition to its feeble insecticidal activity, iodoform greatly increases 

 the adhesiveness of N.C.I, powder for cloth. The inclusion of iodoform 

 in the powder is accordingly justified, although similar adhesiveness 

 of the powder is obtainable at less cost by substituting the insectici- 

 dally inert but cheaper magnesium silicate. The insecticidal power 

 of naphthaline-creosote powders gradually diminishes when they are 

 exposed to the open air. The moist nature of such powders precludes 

 their being used successfully in perforated tins, and it has not been 

 found possible to dry the powders and at the same time retain the 

 moist and volatile hydrocarbons and other coal-tar derivatives on 

 which their insecticidal effect mainly depends, 



Sergent (Edm.) & Foley (H.). Epidemiologie de la fl^vre r^currente 

 [The epidemiology of recurrent fever.] — Malaria e Malattie del. 

 Paesi Caldi, Rome, vii, no. 1, Jan.-Feb. 1916, pp. 1-7. 



The discovery that Pedicuhs humanus {vesfimenti) is a carrier of 

 recurrent fever is described in this paper on the epidemiology of the 

 disease. The infection is hereditary in the louse, 



MoNiz (G.). Destruicao dos mosquitos adultos pelos vapores de 

 creolina. [The destruction of adult mosquitos by vaporised 

 creolin.] — Brazil Medico, Rio de Janeiro, xxx, nos. 6 & 7, 5th & 

 12th February 1916, pp. 41-43 & 51-53, 



The author considers that cresyl or creolin is more effective in 

 destroying mosquitos than pyrethrum fumigation [see this Review, 

 Ser, B, iv, p. 61]. The quantity to be used in closed rooms, for which 

 this method is recommended, is 6 cc. for each cubic metre (40 cubic 

 feet) of space. This should be placed in a container standing on a 

 tripod in a basin of water on the floor. The quantity of alcohol required 

 to vaporise 600 cc. of creolin has been found to be 270 cc. Waste of 

 spirit is thus avoided and the room need not be entered to extinguish 

 the lamp. As the vapour is a heavy one, it is unnecessary to paste 

 up all cracks in the walls and floor; the doors and windows only 

 require to be kept closed for three hours, after which all mosquitos and 

 other insects will be dead. 



NocHT (B.) & Mayer (M.). Merkblatt zur Vorbeugung und Behand- 

 lung der Malaria sowie zur Bekampfung ihrer Uebertrager, der 

 Stechmiicken. [A note on the prevention and treatment of malaria 

 and on the control of its carriers, the mosquitos,] — Milnchener 

 Mediz. Wochenschr., Munich, Ixiii, no, 17, 25th April 1916, 

 pp. 623-625. . 

 ■ This is a. concise .review of present-day knowledge of the prevention 



and treatment of malaria by means of quinine and of the various 



