Ten times natural i 



20 



witb great rapidity. It has 

 been estimated that the third 

 generation springing from a 

 single individual may reach 

 the enoiTuous number of 125, ■ 

 (UU) within twelve weeks. 



While it is true that ne- 

 glect, dirt, fllth, etc., favor the 

 growth and propagation of 

 lice, it should always be re- 

 membered that they cannot 

 appear in the poultry yard 

 unless they are brought in by 

 an infested fowl or by a cage 

 that a fowl has been in or 

 some other object that an in- 

 fested f«*wl has been in contact with. But fowls are 

 interchanged so frecpiently and fowls of different 

 owners oome in contact in so many ways at poulti-y 

 shows, in markets, etc., that it is not at all difficult for 

 a yard that was previously free from these parasites to 

 become infested when least suspected. 



These parasites occasion as much losis as any disease 

 that fowls are subject to. While they alone do nol 

 often kill birds, in many cases they so annoy them b\ 

 their constant irritation that they i)revent sleep and 

 rest so that fowls and especially young ones do noi 

 grow and thrive as they should, and become thin and 

 delicate. In this condition they do not produce eg;;s 

 nor are they good for food, and so long as they con 

 tinue to remain badly infested with lice they are ah 

 solutely unproductive and worthless. 



The conditions that are most favorable to the pro- 

 pagation of lice have already been mentioned briefly. 



