146 MODE OF TRANSMISSION OF YELLOW FEVER 



chink admitting light is sufficient to attract mosquitos 

 to it ; then they make tlieir escape. Halls, water- 

 closets, or outhouses must not he forgotten. 



Considerable objection amongst the poorer classes is 

 usually taken to the disturbance of their homes and their 

 displacement by the fumigation. N^o excuse, other than 

 severe illness in a room, should be taken as exempting 

 any part of the house from fumigation, except the sick 

 room, which should be fumigated as soon as possible. 



After the allotted time necessary to thoroughly 

 complete the fumigation is up, the doors are opened 

 and the floors swept. Some of the mosquitos may only 

 be stupefied, and it is necessary that they be all burnt 

 or otherwise destroyed. 



After the patient is convalescent, or after death, the 

 patient's room is to be fumigated. 



Materinls and Apparatus to he used in Fumigation, 

 and precautions to be taken. — No guesses at the amount 

 of material to be used are to be made, but the room 

 should be carefully measured and materials proportioned 

 to cubic capacity as follows (small closets and wardrobes 

 to be opened) : 



Pyrethrum Powder. — 3 lb. to 1,000 cubic ft. applied 

 for three hours, and it is better that the 3 lb. be 

 divided amongst three pots than that all the powder 

 be put in one pot. The pots to be placed in pans 

 containing a little water. Pyrethrum powder is 

 used for rooms close to the sick patient, as the fumes 

 which might escape from sulpliur fumigation are 

 irritating. 



Pyrethrum powder is also used in cases where 



