Smithsonian Report. 1942. -Stanley 



PLATE 5 



1. Sedimentatinii (iia?rarei of^a'niixturc of tomato tmshy stunt virus with antitobacco mosaic virus rabbit 

 serum. At the (•cntrifu'-'alloicc nsccl. ilir i iulit-liand peak, which is due to the serum protein boundary, 

 is practically stationary, whereas rlie other pi'ak. which is due to the bushy stunt virus boundary, .gradu- 

 ally moves to tile left, 'i'lie sedimentation constant of the bushy stunt virus is essentially unchanged, 

 indicating lack of reaction with tht^ antiserum. 



2. Mixture of Viruses. 



Electron micrograph of a mbcture of tobacco mosaic and bushy stunt viruses with antibushy slimt \ irus 

 rabbit serum. The molecules of tobacco mosaic virus are unafTected: those of the bushy stunt virus are 

 clumped together. Magnification X ca. 1-1,0110. (Bv 'P. F, .\nderson and \V. M. .'-sianlev.) 



