(a 



(«•) 



(b) 



(d) 



Fig. 22. Four stages in the breakdown of a granule from a larva of Natada 

 nararia: (a) the untouched granules; (b) after treatment with weak sodium carbonate, 

 showing the collapse of the outer granule and the inner capsule; (c) a virus rod 

 outside the capsule; (d) dissolution of the virus rod showing the intimate membrane. 

 (Magnification: X 30,000.) 



Fig. 23. Thin section of granules from a 

 larva of P. brassicae, with one virus rod cut 

 longitudinally, showing the inner capsule, 

 and one virus rod cut transversely. Note 

 also the apparent molecular lattice of the 

 outer granule. (Magnification x 80,000.) 



Fig. 24. Frozen-dried particles of the tipu'.a 

 iridescent virus showing the six-sided shape. 

 (Magnification: X 40,000.) 



(Figs. 24, 25, 26 after Smith and Williams 

 1958.) 



