2l8 BACTERIA, YEASTS, AND MOLDS 



feelers on the head of the dangerous species, rather than 

 three as in the harmless form (Fig. 70, a and b), and the 

 method of lighting with the body held in a straight line 

 (Fig. 70, b', b", b'") y rather than bent as in the harmless 

 species (Fig. 70, a' and a"). It must also be remembered 

 that not all mosquitoes, even of the harmful species, will 

 be dangerous. Only those that have sucked the blood 

 from malarial patients will contain the parasites and be 

 able to transmit the disease. In other words, of all the 

 mosquitoes that may bite us in summer only a few are 

 likely to be infected and produce any trouble. We may 

 be bitten thousands of times and still be free from malaria, 

 while the next mosquito that bites us may inoculate us 

 with these parasites. 



That family is the best protected against malaria that 

 is the best protected against mosquitoes. If we live in 

 a region where malaria abounds, it is somewhat dangerous 

 to remain out of doors during the night, or even in the early 

 part of the evening, unless properly protected. At this 

 time mosquitoes are most likely to be flying about. From 

 this fact arises the ground for belief that night air is 

 dangerous. It is not the night air but the mosquitoes 

 in the air that produce the trouble. It is also evident 

 that the best method of protecting a household from 

 malaria is the use of mosquito netting. It is a curious 

 fact that its use at our windows and doors is the best 

 protection from these microscopic parasites, inasmuch as 

 mosquito nettings will keep mosquitoes from the houses 

 and will reduce the chances of contagion. This is not a 

 matter of theory only, for it has been found by careful 

 observation and experiment that the simple procedure 



