Fig. 1. Composite photomicrograph of a hair cell of tobacco showiuir four crystalline 

 inclusions of tol)acco mosaic virus. Phase contrast photomicrograph (Magnification: X 

 500). 



■ Fig. 2. Picture of a centrifuge tube in which turnip yellow mosaic virus was centrifuged 

 for 2 hours at 12,000 r.p.m., showing separation into boundaries. Photograpli by 



scattered liuht. 



