390 



ADVENTURES IX RADIOISOTOPE RESEARCH 



mainly upon the rate of formation of active acid soluble P compounds. 

 This process is much faster than the formation of the apatite crystals 

 of the bone tissue and this fact explains why the replacement of 

 phosphorus in the muscle tissue takes place at a much more rapid rate 



Table 7. — Frog V, Kept at 20 — 24°, Killed after 8 Days 



Ash weight: 3.65 gm 



Weight of fresh tissue Weight of ash 



Per cent of labelled P 

 administered found 

 in 1 Km fresli tissue 



Riglit femur epiphysi.s 

 Left femur epiphysi.s 

 Right femur diaphysis 

 Left femur diaphysis 

 Right tibia epiphysis 

 Left tibia epiphysis . 

 Right tibia diaphysis 

 Left tibia diaph^'sis . 



Right thigh 

 Left thigh . 

 Right calf . 

 Left calf . . 



mgm 



172.lt 



183.9 



412.7 



436.4 



265.9 



237.1 



374.4 



358.7 



gm 

 5.372 

 5.632 

 L925 

 1.980 



Bones 

 mtrm 



33.5 



36.9 

 123.5 

 123.9 



59.6 



62.4 

 141.9 

 130.2 



Muscle s 



3.30 

 3.22 

 2.99 

 2.84 

 2.92 

 3.16 

 3.02 

 2.91 



1.04 

 0.92 

 1.12 

 1.11 



Table 8. — Frog VI, Kept at 22°, Killed after 8 Day.s 

 Ash weight: 3.46 gm 



Weight of fresh tissue 



Weight of asli 



Per cent of labelled P 

 administered found 

 in 1 gm fresh tissue 



Right femur epiphysis 

 Left femur epiphysis . 

 Right femur diaphysis 

 Left femur diaphysis . 

 Right tibia epiphysis . 

 Left tibia epiphysis . . 

 Right tibia diaphysis . 

 Left tibia diaphysis . . 



Right calf 



Left calf 



mgm 



150.6 



169.8 



398.9 



382.0 



263.9 



252.4 



304.3 



282.5 



gni 

 1.520 

 1.584 



Bones 

 mgm 



37J 



37.6 

 130.4 

 122.3 



60.2 



60.7 

 122.6 

 120.9 



Muscles 



4.44 

 2.66 

 3.26 

 3.20 

 2.97 

 3.12 

 3.66 

 3.42 



1.1 

 1.2 



