128 



much as 60 per cent, to 100 per cent, may be used for dusting, but this 

 strength would prove fatal to the birds if rubbed into the skin. The 

 best time for application is at night. 



Les Poissons d'Ornement et Mangeurs de Moustiques dans les Aquariums 

 et les Pieces d'Eau. — Rev. Hortic. de VAlgerie, Algiers, xxiv, 

 no. 1-2, January-February 1920, pp. 32-34. [Received 5th May 

 1920.] 



Ornamental fish that destroy mosquito larvae and are suitable for 

 keeping in aquaria and other water in Algeria include Cyprinodon 

 iherus,Chromis sip-p., Hemichromis sip^)., and especially Macropodus spp. 

 Macropodus paradisi breeds rapidly in captivity. The adults should 

 be fed on finely chopped meat and the small fry on infusoria that grow 

 from lettuce tied up in mushn and floated in the water. In small tanks 

 steps must be taken to prevent the fish jumping out of the water, and 

 in winter some should be kept indoors to re-stock if those outside are 

 killed by the cold. 



Laurie (D. F.). New Regulations for Controlling Poultry Ticks and 

 Lice, also Diseases. — Jl. Dept. Agric, S. Australia , Adelaide, xxxiii. 

 no. 8, March 1920, pp. 697, 698. 



Attention is drawn to regulations (under the Stock Diseases Act, 

 1888), which are to be enforced at once, authorising inspectors to 

 direct owners to take such measures as will be necessary to eradicate 

 an infestation of tick or lice in poultry, and forbidding the removal of 

 infested poultry without permission. The annual value of the poultry 

 industry in S. Australia is nearly a miUion sterling and 90 per cent, of 

 the ailments are traceable to poultry ticks [Argas persiciis]. To check 

 their spread all surplus woodwork in poultry-houses should be avoided. 

 If possible, it is a good plan to burn all infested premises. Where this 

 is not practicable, all woodwork should be dressed with kerosene, and 

 cracks well flooded. All old crates used for poultry should be burned 

 or saturated with kerosene. 



(M. R.). Les Moustiques et les Canards. — Jl. d' Agric. Pratique, Paris, 

 xxxiii, no. 20, 13th May 1920, p. 30 1. 



An experiment is recoided in which two basins of equal size were 

 made in a mosquito-infested stream, one being stocked with fish and 

 the other with ducks. That containing fish continued to show mos- 

 quitos in all stages, but after two days that containing ducks was freed 

 from mosquito Larvae and pupae. This confirms previous observations 

 of the usefulness of ducks in mosquito suppression. 



On the Trail of the Yellow-Fever Germ, — Separate from The American 

 Review of Reviews, [sine loco], April 1920, 8 pp., 5 figs. 



This is a popular account of the history of the discoveries relating 

 to yellow fever, leading up to the work of the Rockefeller Institute in 

 1919. It is claimed that Dr. Noguchi has found the germ of this 

 disease and successfully cultivated it from the blood of men and guinea- 

 pigs. It is closely related to that of infectious jaundice and has been 

 named Leptospira icteroides. The work is still being continued. 



