DOMESTIC ANIMALS. 



181 



posited along the burrow until about 15 have been left 

 in the gallery at different intervals, as is seen in Fig. 82 

 In from 36 to 100 hours the young insects are hatched 

 and begin their work of destruction. There are said to 

 be twice as many females hatched as males, which is 

 in accordance with the well known law that where the 



Fig. 79. Mange insect. 

 Horse. 



Pig. 80. Scab insect. 

 Sheep. 



Fig. 81. Itch insect. 

 Man. 



Gallery or burrow under the skin made by the female mange 

 parasite (showing eggs along the track of the animal.) 



