rj 



r 



Fig. 2. T2 afterexposure to osmotic shook. Many of the heads liave lost the tail structure 

 in addition to DNA. Note tiiat most of the heads are ruptured (Magnification about 

 42,500). (Courtesy of R. Williams.) 



Fig. 3. T2 treated with a solution of ethanol-HjOj for 10 minutes. Note the morpho- 

 logical details visible in the tail (Maunification about 24,000). (From Kelienberuer and 

 Arber, 1955.) 



