764 ISLE OF WIGHT DISEASE IN HIVE BEES— PATHOLOGY. 



DESCRIPTION OF FIGURES. 



Fig. 1. Infected trachea showing typical changes. The black faecal deposit is arranged in transverse 

 lines. ( X 70.) 



Fig. 2. Fragment of wall of infected trachea, shown much enlarged. Granular deposits of fsecal matter 

 lie between the tracheal thickenings. 



Fig. 3. Normal (ra) and atrophied (a) fibres from the thoracic muscle of a crawling bee. Note the 

 density, slenderness, and fractured ends of the atrophied fibres. ( x 50.) 



Fig. 4. Fragment of an atrophied • muscle fibre showing dense ■ longitudiiial columns of- sarcosomes 

 from between which a few fibrillar remnants (/) project. ( x 500.) , 



Fig. 5. A teased-out fragment of an atrophied muscle fibre (A) is contrasted with normal fibrillse and 

 sarcosomes (B). ( x 600.) 



Fig. 6. Portion of atrophied muscle fibre showing blackened spots in its substance which follow the 

 distribution of the tracheoles. 



