Smithsonian Report. l'?42. Stanley 



PLATE 3 



1. Fish in Virus Solution 



Fish swimming through a 0.7 percent solution of tobacco mosaic virus. I'liotographeci between crossed 

 ]iolaroid plates. Light areas show double refraction due to orientation of rodlilsc molecules of virus caused 

 by current set up by movement offish. (By .1. A. Carlile.) 



2 Object in Virus Solution. 



Object moving from left to right through a 0.7 percent .solution of tobacco mosaic virus. Photographed 

 betwe(!n crossed polaroid plates. Light , doubl v refracting areas show nature of currents caused bv moving 

 object. (Bv J. A. Carlile.) 



3. Sedimenting Boundary. 

 .\b.';ori)tion pictures showing sedimenting botmdary of tomato bushy stunt virus. 



