104 



to ascertain whether delousing measures have really killed the louse 

 or have only stupefied it for a time. The author beheves these move- 

 ments to provide the most rehable indication available. 



Prausnitz (W.). Ueber Heissluftentlausung mit Fussbodenheizung. 



[A System of Floor-heating in Delousing with Hot Air.] — Das 

 osterr. Sanitdtswesen, Vienna, xxviii, no. 44-52, November- 

 December 1916, pp. 1674-1698, 19 figs. [Received 12th April 

 1920.] 



Although the researches of Koch and his school have proved steam 

 to be superior to hot air as a delousing agent, the latter has advantages 

 when large masses of material have to be dealt with without running 

 the risk of damage. Furthermore the lice that carry typhus and their 

 eggs are killed by exposure to air heated to 60-80° C. (HO-ITS^'F.). 



It is most important that the chamber should be uniformly heated, 

 and the method described here provides for the heat to be applied 

 under the floor, while the favourable effect is still further enhanced by 

 agitating the air within. The heating is accomphshed by conducting 

 the hot air from the furnace in metal tubes or brick channels beneath 

 the floor. The air within the chamber is agitated by a hand or power- 

 driven fan. Even untrained stokers can work this installation without 

 danger to the articles that are being treated. If thoroughly dry, leather 

 can withstand a temperature of 100° C. (212°F.), but wet leather is 

 injured. By maintaining a temperature of 90-100° 0.(195-212° F.) 

 for 4 hours the bacilU of diptheria, cholera, typhus, etc., are destroyed. 



This paper contains detailed plans of a chamber built on these lines, 

 and suitable for erection in the open air. The outer walls should be 

 hollow so as to conserve the heat. It is pointed out that if the doors and 

 ventilator are previously provided two masons should be able to erect 

 one in 2-3 days. 



HuTCHiNS (E.). Annual Report of the Chief Veterinary Officer.— 



Uganda Dept. Agric. Ann. Rept. Year ended 31st March 1919, 

 Entebbe, 1920, pp. 33-36. [Received 8th April 1920.] 



Extremely heavy losses from trypanosomiasis occurred among cattle 

 inoculated against rinderpest ; a large number of these were found to 

 be infected with Trypanosoma p)ecorum and many died of the disease. 

 Outbreaks also occurred in various districts, Glossina fusca being found 

 in some of the locaUties concerned. 



DoANE (R.W.). Mosquito Abatement in San Francisco Bay District. — 



Mthlij. Bull. Gal. State Dept. Agric., Sacramento, ix, no. 3, March 

 1920i pp. 81-82. 



An account is given of measures adopted in Santa Clara County, 

 Cahfornia, by which mosquitos, which had been intolerably trouble- 

 some in the district for years, were almost entirely exterminated 

 or reduced to neghgible numbers. One side of the region is bounded 

 by a salt-marsh swept during high tides by the waters of San Francisco 

 Bay. The species found were Aeies squamiger and A. onondagensis 

 {Ochlerotatus lativittatus), as well as several fresh-water species such as 

 Theobaldia (Culiseta) incidens and Culex tarsalis. Under a State law. 



