M. A. LAUFFER 



and of the potential usefulness of viscometry in biological and biochemi- 

 cal investigations. The difficulties which remain as obstacles to the 

 interpretation of viscosity data have been discussed in terms of recent 

 theoretical developments. With the exception of the ambiguity due 

 to hydration, the theories discussed point the way to the resolution of 

 the uncertainties still encountered. It seems not too much to hope 

 that studies in the next few years will establish viscometry as a reliable 

 biochemical or biophysical tool, with dignity and meaning comparable 

 to diffusion and ultracentrifugation. 



References 



(1 



(2 



(3 



(4 

 (5 



1 

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( 



(8 

 (9 

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( 

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21 

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