227 



probable that hatching and ovipositioii will be stopped if, at night,, 

 all clothes are taken oft' and placed where the temperature is under 

 61° F. and all bedding is left during the day in an unheated place. 

 Eggs hatched normally when kept in small covered glass dishes, without 

 any special precaution. At 94° F., which appears to be the optimum 

 temperature for all stages, hatching occurred after 144 hours ; the 

 eggs were killed at higher temperatures. They appear to be very 

 hygroscopic,, so that steam laden with a poison might be used to destroy 

 them. At a distance of 1 or 2 cm., the human skin usually attracts 

 the lice, but at 3 cm. the attraction is doubtful. 



This paper closes with a few notes on Haematopinus suis (swine 

 louse) which seems a suitable species for experimental work. A 

 bibliogi-aphy of eight works is added. 



Penschke ( — ). Prophylaxe gegen Sandflohe. [Prophylaxis agiinst 

 chiggers.]— ^rc/?-. f. Schiffs- u. Trap. Hyg., Leipzig, xix, no. 5, 

 March 1915, pp. 150-151.' 



Against Dennaiophilus penetrans 15 drops of lysol or cresol soap' 

 solution are mixed wath 3-| oz. of vaseline, and this is rubbed into the 

 feet after they have been w^ashed. Protection has thus been obtained 

 against chiggers for at least three days, even in badly infested districts. 

 Chiggers which have already entered the skin are quickly killed and 

 are easier to remove than when alive. This method was reported on 

 from various parts of German East Africa, but not ahvays favour- 

 ably. Non-success may be due to the application not having been 

 made at bed-time — when the preparation would have time to permeate 

 the tissues. One of the unfavourable reports stated that efficiency 

 was only obtainable if the application was a daily one. 



Eysell (A.). Nachtrag zu " Eine infach es Vorbeugungsmittel gegen 

 Verlausung und ihre Folgen." [A further note on a simple preven- 

 tive against louse-infection and its results.] — Arch. f. Schiffs- u. 

 Trop. Hyg., Leipzig, xix, no. 8, April 1915, pp. 238-240. 



Precipitated sulphur, which is recommended against lice, is an 

 extremely fine amorphous pow^der which does not cause irritation of 

 the skin, as is the case when the crystalline flow^ers of sulphur is used. 

 Colloidal sulphur presents no additional advantage and is very much 

 dearer. Sulphur ointments are uncomfortable, soil the clothes and 

 do not act within the clothes in which the lice hide. Brushing is the 

 simplest means of applying the powder. In the case of individuals 

 who perspire freely the effect lasts about a fortnight ; in normal cases, 

 about a month. 



Wesenberg (G.). Zur Bekampfung der Lauseplage. [Towards 

 combating the plague of lice.] — Deutsche Med. Wochenschr., 

 Berlin, xli, no. 29, 15 July 1915, pp. 861-862, 



The author states that anisol has now been discarded by the Austrian 

 authorities. He himself experimented w^ith it and prefers either cvclo- 

 hexanone, C(CH-)^CO, alone or with cyclohexanol, C(CH-)\CHOH, 

 For use, inert powders are impregnated with these substances. 



