418 CONSTITUENTS OF GLANDULAR SECRETIONS. 
respect, the observations of Virchow, Frerichs, and Stadeler 
agree. 
2. Tyrosine does not constantly accompany leucine in the 
organism us. I have only been able once to find it in the 
pancreas. It appears, as the observations of Frerichs and 
Stadeler show, to exist frequently under certain conditions, 
but was not found by them to be a constant companion of 
leucine, and consequently there seem to prevail analogous 
relations with regard to the existence of these bodies, as in 
the obtainment of tyrosine with leucine by the treatment of 
albumen with caustic alkalies, where it depends chiefly on the 
duration of the treatment whether leucine besides tyrosine is 
obtained, because by a further continuance of the decompo- 
sition the tyrosine is destroyed. 
3. In the spleen there is, besides leucine, a body probably 
homologous to it, and another whose nitrogen amounts to 
9*09 per cent., agreeing very nearly with a body which 
Frerichs and Stadeler found crystallized in urine, and was 
very analogous to tyrosine, with which they believed it to be 
homologous, as it contained B’SB per cent of nitrogen. 
4. In the pancreas of oxen, there exists in considerable 
quantity a body of the formula C H n N 0 4 , homologous to 
leucine and very analogous to it. Whether this body is a 
constant constituent of that gland, or is only formed in it 
under certain conditions, could not be ascertained. From 
my observations and those of the above-mentioned investi- 
gators, it would seem that leucine, as well as tyrosine, exist 
frequently associated with bodies homologous to them. 
5 . Scherer’s hypoxanthine was with certainty detected not 
only in the spleen, but also in the thymus and thyroid glands. 
On the contrary, uric acid, with the exception of the spleen, 
was sought for without avail in all the examined glands. 
6. Volatile acids of the formulae (C H) Q 4 were contained 
in all the examined glands. In the thymus gland, formic 
and acetic were particularly found, the latter in prepon- 
derating quantity. 
7. In the thymus gland of calves, in the spleen and in the 
thyroid gland of oxen, succinic acid was detected. On the 
contrary, in the liver, the pancreas, the kidneys, and the 
lungs, this acid could not be found. 
8. The inorganic constituents of the thymus gland of calves 
consist, for the greater part, of alkaline chlorides and phos- 
phates. The quantity of potash amounts to about three times 
that of soda ; the quantity of phosphoric acid was about 
double that of chlorine. The quantity of magnesia pre- 
ponderates over that of lime. Sulphuric acid is present in 
