326 
PACIFIC SCIENCE, Vol. XVII, July 1963 
1 H 
'•••••••Si 
: ' : 
• , 5JWs**1 v «»**•.*« 
• .*?*•*•* *A!‘*.»* • *««*.*. 
I*.* ••«•<*# ,*#♦*•■ *f*V *.♦•**«*;? 
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*• » • i * i * y *«* ♦•**••, * * *****1 * 
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Fig. 4. Examples of time-lapse photomicrographs taken with the device. Each vertical column represents one 
sample culture in an X-irradiation experiment. Column 1 is the control, or Or; column 2 was subjected to 5r; 
and column 3 to 20r. The top horizontal row was taken at 1:25 P.M. or 85 min post-fertilization. The second 
horizontal row was taken at 1:30 P.M.; the third row at 2:15 P.M.; and the fourth row at 3:00 P.M. or 180 
min post-fertilization. 
