112 LETTER BY MR. BAILEY [CHAP. xiv. 



they were asked to examine their cattle at home, and to 



FIG. 7. PIECE OF UNDER SIDE OF WARBLED HIDE ; WARBLES ABOUT 

 HALF SIZE. 



From a Photo by Messrs. Byrne, Richmond, Surrey. 



bring to school as many specimens as they could collect of 

 the maggots of this fly. Hundreds were squeezed out and 





FIG 8. BREATHING-TUBES OF MAGGOT (TO WHICH THE SMEAR IS APPLIED), 

 MAGGOT, AND PRICKLES OUTSIDE SKIN OF MAGGOT (ALL MAGNIFIED). 



brought in the course of a few days. One boy alone 



