98 TROPICAL MEDICINE AND HYGIENE 



persons the smell of these scents is almost more objec- 

 tionable than the insect-bites. A mixture of several 

 essential oils is more effective and less objectionable to 

 many people than a single more powerful one. Colonel 

 Alcock advocates the use of the following application to 

 the skin as effective and not objectionable : 



Ol. bergamot 

 Ol. cloves 



Ol. lavender aa ss. 



Ol. terebinthinse ... ... ... ... 5- 



Quinime sulphate ... ... ... gr. xx. 



Sp. vini rect. ... ... ... ... %vm. 



Water to I pint. 



For mosquitoes the destruction of the nearer breeding 

 places will, especially if the mosquitoes are Stegomyia, 

 greatly diminish the trouble. 



MYIASIS. 



Myiasis Many flies deposit larvae in wounds and 

 ulcers in the skin or on mucous surfaces. Some deposit 

 larvae which are capable of penetrating the skin, and in 

 others the larvae are themselves blood-suckers. Larvae 

 are occasionally passed with the faeces. To all these 

 affections the term Myiasis is applied. In some cases 

 the larvae do not actually invade the living tissues, but 

 remain on the surface, and though causing irritation and 

 increasing the area and extent of the wound, do not do 

 the same damage as in the species whose larvae live on 

 the live tissues. 



The larvae may belong to several genera and to various 

 species in each genus : Sarcophagidce, several species, 

 Sarcophaga ruficornis in India, S. regularis in Africa, and 

 S. chrysostoma in America, are three of the more important 

 which attack wounds ; S. carnaria has been found in the 

 nose, conjunctivae, anus, vagina, and in abscesses. Sarco- 

 phila : Some species deposit their living larvae in wounds. 

 Lucilia of several species have been found in wounds in 

 man, whilst the L. sericuta is the cause of " maggot " in 

 sheep. 



