62 



PROGRESS IN MICROSCOPY 



phenomenon typical of amplitude and phase distribution in the photo- 

 graphic plate. Assuming the phase variations to be negligible and 

 considering amphtude changes only, the image shown in Plate P is 



Fig. 1.80. Hepato-pancreas of a snail (helix) (autoradiography). 



Fig. 1.81. Hepato-pancreas of a snail (helix) after filtering. 



