Smithsonian Report. 1942. — Stanley 



1. EUECTROPHORETIC PATTERN. 



?liown by a 0.1 percent solution of tobacco mosaic virus, a and d represent the ascending and descending 

 boundaries at the start of the experiment, o' and d' represent the same boundaries at the end. (Bv O. A. 

 Miller.) 



Absorption pictures of Tobacco Mosaic Virus Showing Two Sharp 

 sedimenting boundaries. 



3. Doubly Refracting Stream of Tobacco Mosaic Virus Flowing From 



A Pipette. 



Left, photopiraphed bet ween crossed polaroid plates arranced so that each vibration direction of the polaroid 

 plates makes an ant;le of 4.5° with direction of flow. Right, same system photographed between parallel 

 polaroid plates. (From .lournal of Biological Chemistry.) 



