4 ' CONTENTS. 



Results and discussion — continued. p 



(d) Difference between physiological and piu-ely chenaical temperature- 



velocity reactions 42 



Physiological processes 42 



Growth or permanent bulk increase 42 



Mitosis 43 



(e) The reactions of definite mitotic stages 44 



General survey 44 



The movement of chromosomes 45 



The peculiar reaction of mitotic stage No. 6 45 



Summary 4q 



References 47 



Charts, Diagrams, and Tables measuring the relative and absolute durations of the several 

 mitotic stages, and determining the relation between temperature and velocity of each 

 definitely marked stage of the mitotic cycle. (All but the frontispiece in serial order 

 following page 48.) 



Summary chart. Frontispiece. 

 First series: Principles. 



1. Method chart. 



2. Properties of four condition-complexes. 



3. Principles and formulas. 



Second series: Preliminary study— Based upon 13,000 cell-counts distributed among 

 11 stages, through 13 observation-instants (from 10 a. m. to 12 noon), 

 at approximately 18° C. 



4. Stage index table. 



5. Graphs showing mitotic and stage indices. 



6. Procession index table. 



7. Graphs showing orderly succession of procession indices. 



Third series: Final study — Based upon 55,000 cell-counts distributed among 11 

 stages, through 19 observation-instants (from 10 a. m. to 1 p. m.), 

 one-third at 10° C, one-third at 20° C, and one-third at 30° C. 



A. Average relative durations of the several mitotic stages. 



8. Stage index table. 10° C. 



9. Stage index table. 20° C. 



10. Stage index table. 30° C. 



11. Graphs showing mitotic indices at 10° C, 20° C, and 30° C. 



B. Average absolute durations of the several mitotic stages. 



12. Procession index table. 10° C. 



13. Procession index table. 20° C. 



14. Procession index table. 30° C. 



15. Table: Summary and comparison by stages and temperatures. 



16. Comparison at 10° C, 20° C, and 30° C. of average relative durations. 



17. Comparison at 10° C, 20° C, and 30° C. of average absolute durations. 



18. Graphs showing comparative average absolute durations at 10° C, 20° C, 



and 30° C. 

 Table: Qio values (on page 38 of text). 



