952 



ENERGETICS AND ENERGY-SOURCES [pt. iii 



days of incubation. The distribution of chemical energy in the 

 finished embryo was as follows: 



Table 117. 



To a large extent these figures reflect the varying fat-content of the 

 individual parts of the body. Comparative researches on this subject 

 at different stages of development might reveal some interesting 

 relationships. 



The paper of Tangl & v. Mituch contained a more accurate in- 

 vestigation of the energy relations in the hen's egg. The individual 

 differences between energy-content of embryos from different hens, 

 etc., were found to be exceedingly small; and the average figure 

 for the Ea. was 22-94 Cal. This was distinctly higher than the corre- 

 sponding value given by Tangl in his first paper, and it meant, of 

 course, that the R.Ea. and S.Ea. were also higher than he had at 

 first thought. The following table shows the figures for six embryos : 



so that the average result was R.Ea. 805 cal. and S.Ea. 3600 cal. 



Tangl's second paper was concerned with an attempt to carry out 

 his ideas, working with various bacilli during the development of 

 cultures. His work in this field will be found assessed in Stephenson's 



