17 



methods of disinfection usually practised against these rodents leave 

 very much to be desired. It has been found that to exterminate rats 

 entirely on a wooden ship at Naples no less than three fumigations on 

 three consecutive days are necessary. 



The measures needed include careful daily examination of all parts 

 of vessels and docks, sustained and intense rat-extermination work, 

 and the adoption in all harbours open to international traffic of a 

 separate sewer system entirely distinct from the municipal sewers 

 [R.A.E., B, vih, 202]. 



Scott (J. W.) & O'Roke (E. C). Sarcocystis tenella. The Muscle 

 Parasite o£ the ^\\q%v.— Wyoming Agric. Expt. Sta., Laramie, 

 Buh. 124, June 1920, pp. 69-94. [Received 11th November 1920.] 



The results of a large number of experiments with lambs, here 

 described, indicate that infection with Sarcocystis tenella takes place 

 independently of the presence or absence of insects, and the feeding of 

 lambs with hundreds of the particular insects that appeared to be the 

 only possible carriers of the infection gave negative results. The theory 

 of an infective intestinal stage seems the most probable, infection 

 resulting when sheep eat food contaminated with infective faeces of 

 other sheep. 



Scott (J. W.). Parasitology Department.— 2M Ann. Kept. Wyoming 

 Agric. Expt. Sta., 1918-1919, Laramie, 1920, pp. 154-157. 

 [Received 11th November 1920.] 



The most serious parasites of the horse noted were bots, lice, and the 

 usual biting flies. Gastrophilus intestinalis (common bot fly) was 

 frequently encountered, but G. haemorrhoidalis was reported only 

 from the northern part of Wyoming. Swamp fever has not been 

 prevalent. 



Of sheep parasites one of the most serious is the Hippoboscid fly, 

 Melophagus ovinns (sheep tick), which probably costs the State 

 £40,000 annuaUy for dipping alone. Several other common pests, 

 such as mites and hce of poultry, lice on horses and cattle, mosquitos 

 and biting flies, were present in their customary frequency. 



Among human beings fewer deaths have occurred from Rocky 

 Mountain spotted fever than in former years. The disease is possibly 

 becoming less virulent, though it may be that better knowledge of it 

 has resulted in greater precautions being taken against ticks. 



Hase (A.). Neue Beobaehtungen und Versuche iiber die Lebens- 

 Jahigkeit der Kleiderlause und ihre Eier. [New Observations 

 and Experiments on the Viabihty of Clothes Lice and their Eggs.] 

 —Centralbl. Bakt., Parasit. u. Infektionskr., Jena, Ite Abt., Orig., 

 Ixxxii, no 6, 28th February 1919, pp. 461-468. [Received 

 17th November 1920.] 



These results relating to Pediculus Immanus (vestimenti) are published 

 in the hope of prompting the publication of any divergent findings, in 

 view of the necessity for an accurate knowledge of the life-histories 

 of lice. 



The maximum period during which P. humanus resisted starvation 

 was 7 days at summer temperatures, 10°-37° C. (50°-99° F.), and 



(7467— b) c 



