16 





Plate 5. 



Sac'brood: 1, 2. Healthy brood at the age at which it dies 

 of Sacbrood; 3, 4. Brood recently dead of disease; 5, 6, 7, 8, 

 9, 10. Brood in various stages of deca'<'. 



— (Reproduced from U.S.D.A. Bulletin 431.) 



