THYSANOURA, PARASITA, SUCTORIA. l69 



If, towards the end of autumn, and the commencement of 

 spring, the different articles of furniture that we use, were 

 exposed to a heat of sufficient strength, the sources of our 

 inconveniences would be speedily destroyed, and at all events 

 we should cease to calumniate Nature, even if we had not 

 sufficient gratitude to study and admire her. But a small 

 number of the species of the flea is as yet known ; but it is 

 probable that if the fleas of different animals w^ere examined 

 with a little more attention, that several others might be 

 discovered. 



