212 PICTURING MIRACLES 



of every step, and for the microscopic subject take 

 the reading of the light delivered at the aperture of 

 the camera and the others close to the subject. 



This means making nine tests of, say, five feet each, 

 using type A Kodachrome film. It can be done on a 

 5o-foot spool. 



In all future work of kindred colored subjects and 

 regardless of the magnification in the microscope, 

 only the strength of the light will have to be meas- 

 ured in the same way to figure the time necessary for 

 the correct exposure and fixing the true color in 

 the picture. 



