THE PLATES 



Numbers I, 2, 3, 5, II, 12, 14, 15, 20 and 23-27 of these Plates are enlargements 

 from frames of i6 mm time-lapse films of living cells in tissue culture. The phase 

 microscope was us 2d for all of these except No. 20 which is taken by polarized light. 

 Such 'stills' give only a partial idea of the changes which are revealed by the 

 film itself. The cultures of the spleen of the mouse and rabbit were prepared by 

 Dr H. B. Fell; those of chick tissues were made by Mr L. J. King or Miss J. 

 Ravvlinson. 



Abbreviations in keys 



C Central body or aster. CF Cleavage furrow. Ch Chromosomes, or 

 groups of chromosomes. G Granule. H Heteropycnotic chromocentres. 

 M Mitochondria. N Nucleoli. NM Nuclear membrane. S Spindle. 

 PK Pole cap. V Vacuoles. Z Cell plate. 



A reel of 16 mm film including these sequences is being prepared and will be deposited in the 



Film Library of the Royal Microscopical Society (B.M.A. House, Tavistock Square, London, 



W.C.I.)- Copies may be purchased from Science Films Ltd., Bromley, Kent. 



