1905-6.] Excretion of Allanto'in in Thymus Feeding. 101 
After raw thymus a marked rise in allanto'in excretion was 
observed. 
Table II. 
Observations. 
Allantoin in 
grammes per 
diem. 
Allantoin Nitrogen 
in grammes 
per diem. 
Food. 
Raw Thymus. 
1. Setter 
5-039 
1-786 
950 grm. 
2. Setter 
6*906 
2-448 
950 grm. 
3. Retriever 
3-698 
1-311 
680 grm. 
This simply confirms the results of Salkowski. 
Are the nucleins and pur ins of the thymus administered the 
source of the allanto'in excreted ? If this were so, simply boiling 
the thymus given to the animal, since this does not change the 
nucleins or purins, should not modify the yield of allanto'in. 
The question was tested in two ways. 
1st. By estimating the excretion of allanto'in per 100 grm. of 
raw and per 100 grm. of boiled thymus gland administered. 
These results may be tabulated thus : — 
Table III. 
Raw Thymus. 
Observations. 
Allantoin. 
Allantoin per 
100 grm. 
Thymus, less fat. 
Food. 
Per cent. 
Per diem. 
1. Setter 
2-65 
5-039 
•616 
950 grm. 
2. Setter 
1-151 
6-906 
•690 
950 grm. 
3. Retriever 
bitch 
•617 
3-704 
•708 
680 grm. 
Average, 
5-2 
•671 
860 grm. 
