74 



Scientific Proceedings (52). 



51 (747) 



The Kernplasmarelation during the life of a pedigreed race of 



Oxytricha fallax. 



By LORANDE LOSS WOODRUFF. 



[Sheffield Biological Laboratory, Yale University.] 



The following conclusions were reached from a study of cells 

 during periods of characteristically different reproductive activity 

 of an 860 generation pedigreed race of Oxytricha fallax: 



1. A wide variation in the size of the cells and of the nuclei 

 occurs at all periods of the life of the race. 



2. The mean size of the cell is smallest at periods of high repro- 

 ductive activity and becomes progressively larger as the division 

 rate falls. 



3. The mean size of the nucleus is smallest at periods of high 

 reproductive activity and becomes progressively larger as the 

 division rate falls. 



4. The Kernplasmarelation of individual cells shows a wide 

 variation at all periods of the life of the race. 



5. The mean proportion of nuclear to cytoplasmic material is 

 highest during the period of greatest reproductive activity. 



6. The size of the cell and the size of the nucleus as well as the 

 Kernplasmarelation are interpreted as an incidental result rather 

 than as a cause of the rate of cell division. 



52 (748) 



The reaction between oxygen and hemoglobin. 



By E. E. BUTTERFIELD. 



[From the Rockefeller Institute for Medical Research.] 



There are at present four different views as to the nature of 

 the absorption of oxygen by blood. 



The first and oldest view is expressed by the reation, 

 1 mol. hemoglobin + 1 mol. oxygen i mol. oxyhemoglobin. 

 According to the law of mass action one would have 



ab = kc, (1) 



