THE BOT- OR WARBLE-FLY 35 



question confronts us, which once confronted 

 George III apropos of the apple in the apple 

 dumpling, ' How the devil did it get in ? ' 

 There seems to be with Hypoderma but two 

 possible modes of entrance into the body 



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Fig. 10. — Eggs of H. bovia attached to hairs. 

 Note attachment near base. Slightly enlarged, 

 ' (From Hadwen.) 



of its host — ^that is, domesticated cattle : (1) 

 The eggs, or the newly hatched larvae, are 

 licked up by the tongue, as are the eggs of the 

 horse bot-fly — and this might be held to 

 explain the not infrequent occurrence of the 

 second larval stage in the walls of the oesopha- 

 gus ; or (2) the larvae bore their way directly 

 through the skin. From experiments carried 



■D 2 



