228 MACROMOLECULAR COMPLEXES 



achieved by outward thrust of Hquid at considerable velocity. We are cur- 

 rently attempting to calculate a minimum velocity for the thrust to result m 

 the observed crystalline orientation. 



Dr Bergeron (Brookhaven National Laboratory): Is the cross-lmkmg m 

 the bud scar irreversible with regard to the later formation of overlappmg 



"" Dr Nickerson: Apparently so. The photographs of Barton (1950), who 

 first observed bud scars, show no overlapping, even on cells with numerous 

 scars. Our electron micrographs also show no overlapping of bud scars. 



