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S h o u l d m o t i o n analysis o r time study b e the purpose o f the investigator, a V a n g u a r d o r equivalent analyzer m a y b e needed, or a p r o j e c t o r e q u i p p e d to c o u n t frames, to stop o n single frames w i t h o u t damage to the film, to project the film at different speeds, or to repeat selected cycles of action in the record by c o n t i n u o u s p r o j e c t i o n o f a loop. ; the apparatus assembly may include very highly speĀ­ cialized film h a n d l i n g instruments.

P a r t i c u l a r l y in the spindle-shaped cells, the cytoplasmic m o t i o n frequently was wavelike o r peristaltic. Such a wave m i g h t repeatedly travel b a c k a n d forth along the l e n g t h of a cell, with the cell r e m a i n i n g a n c h o r e d to the glass substrate p r o b a b l y by its terĀ­ m i n a l processes. Small secondary processes sometimes p r o j e c t e d a n d withdrew from the periphery of the cells in a p p r o x i m a t e l y half-hour cycles, a n d short lateral extensions often p r o j e c t e d from b o t h the m a j o r a n d secondary processes.

I t is clear, w i t h o u t u n d u e emphasis, that the most satisfactory results are f o r t h c o m i n g w h e n the e q u i p m e n t is carefully chosen for the field of work it is to b e used for. A c a m e r a with i n t e r c h a n g e a b l e magazines is certainly preferable. A t e m p e r a t u r e recorder on the i n c u b a t o r is always desirable. A n y thermoregulator is certain to fail sooner or later. Such failure m a y result in gross overheating, a n d this in t u r n is almost certain to result in d a m a g e d lens systems.

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