954 ENERGETICS AND ENERGY-SOURCES [pt. iii 



3125 cal. Farkas was naturally struck with the resemblance between 

 these figures and those which in the previous summer had been found 

 to hold for the hen's egg by Tangl, i.e. R.Ea. 658 cal. and S.Ea. 

 3426 cal. Considering that the hen's egg weighs 70,000 times as 

 much as the silkworm's egg, and the hatched chick 50,000 times as 

 much as the hatched silkworm, the agreement was remarkable. It 

 meant that, in order to produce i gram of finished embryo, whether 

 of the silkworm or the chick, and whether wet or dry weight was 

 considered, about the same amount of energy was required for com- 

 bustion purposes. It meant that in each case about the same degree 

 of wastefulness was found in embryonic development; thus the 

 average overall number of calories per gram of finished chick (dry 

 weight) was 5771, and the average number of calories wasted in 

 producing this result was 3426; therefore the work was done with 



an efficiency of 62-9 per cent. I ■ ^^ 7, x 100). Tangl and his 



5771 + 3426 / 



associates, however, did not emphasise this aspect of the question, 

 for they were more interested in the problem of the relations 

 between energy and form. They did not look on the energy of the 

 substances combusted as energy wasted, i.e. as energy lost during 

 development, but rather as energy associated in some way with the 

 assumption of structure and form, i.e. as energy lost for develop- 

 ment. 



Table 119. 



Used during development 



Farkas went on to point out that, during the development of 

 19-54 gm. of silkworm larvae, 2-03 gm. of dry substance had dis- 

 appeared from the eggs, corresponding to 17-23 Cal. of energy. 

 The specific energy-content of the substance lost (energy per gram 

 dry weight) was 8-51 Cal., which differed from the results obtained 

 by Tangl on the hen, i.e. between 9 and 10 Cal. The analytical 

 figures permitted Farkas to conclude that the Ea. of the silkworm's 



