190 



Cleare (L. D.), Junr. Some Parasites of Man and Animals in British 

 Guiana. — Brit. Ginana Med. Annual for 1919 (22nd Year), 

 Demerara, 1919, pp. 58-77. 



This paper may be considered supplementary to a previous article 

 [R.A.E., B, V, 4], and represents an attempt to give a fairly complete 

 list of animal parasites, exclusive of mosquitos, so far recorded from 

 the Colony. 



Chalmers (A. J. ). Oedema of the Eyelids caused by Ants. — Jl. Trop. 

 Med. <& Hyg., London, xxii, no. 12, 16th June 1919, p. 117, 1 plate. 



The observation recorded here confirms the .author's suggestion 

 {R.A.E., B, vii, 6] that oedema of the eyehds in Europeans and natives 

 in Khartum may be caused by an ant, Monomoriiim bicolor, subsp. 

 nitidivetitre. 



Delmege (J. A.). Some Practical Notes on the Prevention of Mosquito 

 Breeding. — Jl. Tro]). Med. & Hyg., London, xxii, no. 19, 

 1st October 1919, pp. 181-184, 7 figs. 



Some results are given of anti-mosquito work in Macedonia, chiefly 

 effected during the summer of 1918. 



Surface-drains should be deep (not less than 1 foot), narrow at the 

 base, and with sloping sides. The sod along the edges should be turned 

 back at least one foot, as this delays the re-growth of the grass. 

 Spraying wdth cresol solution (about 1 in 500) also considerably delays 

 vegetation. Stones on the edges of channels and streams should 

 be avoided, as breeding takes place in the cre\dces, but large stones 

 placed 4-6 inches from the edges are very useful in preventing the 

 channel being trodden in by animals and men. For covering wells, 

 etc., sacking on a wooden framework is suitable, but easily damaged. 

 Corrugated iron is most unsatisfactory, as being almost impossible 

 to make mosquito-proof. Light wood covers, carefully caulked, are 

 the best. 



AU bushes and overhanging branches on streams should be cut 

 back so as to permit a man to walk do^ATi the stream without touching 

 them on either side. Streams running in sandy beds broken by rocks 

 are best diverted. This also apphes to streams through small marshes. 

 In the case of partly stagnant streams in fiat land the best method 

 consists in digging a line of pits in the course of the stream at intervals 

 of about 15 yards (the f^ize of each pit and the distance between them 

 varjnng much according to the nature of the ground) ; these pits 

 can be kept clean and cresolised. Ponds for watering horses should 

 be made, not by damming a stream, but by cutting a clean deep basin 

 in one side of the channel. 



Where an oil film is blown aside by winds or dispersed by frogs, 

 petroleum is most unsatisfactory ; a solution of cresol is preferable— 

 1 in 100,000 in standing water and 1 in 1,000 (roughly) in slow-flowing 

 streams. To make the solution, about equal quantities of cresol 

 and water were used ; a larger proportion of cresol mixes with difficulty. 

 In deahng with gardens, horse-troughs, and pools used as decoy 

 pools, it is essential that the dilution be as accurate as possible. The 



