Silicon monoxide replicas of the surfaces of air‐dried films are shown which were cast from a Saran latex containing various amounts of plasticizer. It can be observed that the poor films are composed of discrete individual particles while in a continuous transparent film the particles have coalesced into a polymeric mass. Replicas of surfaces of films are shown which were produced from different types of synthetic latices before and after they had been plasticized.

1.
R. C.
Williams
 and
R. W. G.
Wyckoff
,
J. Appl. Phys.
17
,
23
(
1946
).
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© 1952 American Institute of Physics.
1952
American Institute of Physics
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