280 



ADVENTURES IN RADIOISOTOPE RESEARCH 



rences. The semi-solid yolk shell formed from very active blood was found in 

 one case to be seven times more active than the fluid interior of the yolk, and 

 five times in another case. With decreasing size of the yolk the difference between 

 the specific activity of the yolk phosphorus originating from the inner and llio 

 outer part of the yolk diminished and finally vanished. 



Table 4. — Active Phosphorxts Content of Eggs. Hen I. 



Percentage of active phosphorus administered found in ; 



Egg laid after ad- 

 ministration of active 

 pliosphorus 



Shell 



AUiumin 



Total yolk Yolk lecithin 



0.17tlay.s 

 1.0 „ 

 3.0 ,. 

 4.5 „ 

 6.5 ., 



0.24 



0.052 



0.036 



0.026 



0.022 



0.0015 



0.032 



0.030 



0.027 



0.020 



0.0014 

 0.100 

 0.42 

 0.95 



0.85 



0.000 



0.014 



0.17 



0.34 



0.35 



Table 5. 



Hen I. 



Percentage active phosphorus administered found in 1 mgm egg phosphorus x 10^. 



(Specific activity x 10=). 



Table 6. — Distribution of the Active Phosphorus Administered 

 between Different Parts of the Egg 



Egg laid after administra- 

 tion of active phosphorus 



;<hell 



Albumin 



Yolk after 



extraction of 



phosphatides % 



Yolk lecithin 

 phosphatides % 



0.17 days 



1.0 „ 



3.0 „ 



4.5 „ 



6.5 „ 



0.5 (lay.s 



3 

 4 

 6 



98.9 



27.0 



7.0 



2.6 



9 r^ 



46.1 



30.5 



15.0 



7.2 



Hen I. 



0.6 

 17.0 

 6.0 

 2.7 

 2.2 



Hen II. 



35.0 



6.8 

 6.2 



2.8 



0.5 

 48.8 

 50.9 

 60.5 

 56.0 



0.0 



7.2 



36.1 



34.2 



39.3 



