171 



The commonest ecto-parasite of the sheep is the Hippoboscid fly, 

 Melophagus ovinus (sheep tick), which is a blood-sucker and also 

 destroys the wool-fat. It is easily killed by dipping in any of the 

 commonly used dips, such as those made from coal-tar. 



Sheep are infested with two varieties of lice, blood-sucking and 

 wool-eating, both of which yield readily to treatment with the ordinary 

 •commercial sheep dips, two applications with an interval of 10 days 

 being necessary. 



Scabies in sheep is difficult to diagnose, but it may be successfully 

 treated by dipping in a lime and sulphur or tobacco and sulphur 

 solution at a temperature of 100° to 105° F., in which the sheep must 

 remain for at least 3 minutes. This treatment must be repeated 

 after 10 to 14 days, to destroy the newly hatched parasites. The 

 sheds, etc., where infested sheep have been should be disinfected 

 and all woodwork and floors saturated with the solution. All litter 

 should be burned and the infected range should not be used for 

 several months. The time required to kill these parasites trom want 

 of animal novirishment is unknown. 



NoGucHi (H.) & Kudo (R.). The Relation of Mosquitoes and Flies to 

 the Epidemiology of Acute Poliomyelitis. — Jl. Exptl. Medicine, 

 Baltimore, xxvi, no. 1, 1st July 1917, pp. 49-57. 



The authors' summary of this paper is as follows : — 1. Culex 

 pipiens raised from the larval stage in water experimentally contami- 

 nated with an abundance of poliomyelitic virus were found to be 

 incapable of causing the infection when allowed in large numbers 

 to bite normal Macacus monkeys. 2. Culex pipiens fed on infected 

 poliomyelitic monlceys during different stages of the disease were found 

 to be incapable of transmitting the infection when allowed in large 

 numbers to bite normal Macactfs monkeys ; a previous disturbance 

 of the meninges by an injection of horse serum into the intrathecal 

 space did not alter the result, which was negative. 3. The offspring 

 cf the mosquitos which were either reared in the infected tanks or 

 fed on infected monkeys were found to be entirely harmless when 

 allowed to feed in large numbers on a normal monlcey ; there was 

 no hereditary transmission of the virus from one generation to another. 

 4. No trace of the virus of poliomyelitis was demonstrable in the 

 filtrate of an emulsion of adult flies and pupae of the common house-fly 

 and bluebottle fly which were reared in the laboratory on slices, 

 emulsion, or filtrate of monkey brain containing the poliomyelitic 

 virus. The intracerebral injection of the filtrate produced no 

 poliomyelitic infection in the normal monkey. 



Gumming (J. G.). Rocky Mountain Spotted Fever in California. — Jl. 



Infectious Diseases, Chicago, III., xxi, no. 5, November 1917, 

 pp. 509-514, 4 figs. 



In June 1916 the results of animal inoculations in cases described 

 in this paper definitely established the occurrence of Rocky Mountain 

 spotted fever in California. The finding of the tick, Dermacentor 

 vennstns, in Ventura County and the occurrence of a case there marks 

 that region as a new area of possible prevalence of this disea^se in 

 California. 



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