TISSUE RESPIRATION IN INVERTEBRATES 



a 



uj 3 







3 



B 







A 6 _ 

 3 _ 



^ f^ u m 



^ 



M. 



YEAR OF STUDY 



Fig. 6. Frequency distribution of methods used in studies on invertebrate tissue respira- 

 tion from 1929 through 1959 arranged according to year in which the studies were published. 



Methods indicated are: A. Manometric (Warburg, H ; unspecified, ^ ). B. Differential 



(Bar croft, ^ ; Fenn, ^ ; Thunberg,y ; unspecified, J ). C. Micro volumetric. D. Chemical 



(Winkler and micro -Winkler). E, Spectrophoto metric. F. Polarographic. G. Miscellaneous. 



