at Home and Abroad . 
93 
1 877.] 
in the spermatozoa of some vertebrates. Finally, its presence 
in human brain is re-asserted by Rudolf von Jaksch,* of 
St. Petersburg, a student in Hoppe-Seyler’s laboratory. 
We here reproduce, in tabular form, the percentage compo- 
sition of these various preparations, as given by the several 
authors 
From From From Pure Nuclein From 
Yeast- Cells, Milk-Casein, Pus-Cells, from Sper- Brain, 
by Hoppe- by by Hoppe- matozoa, by by 
Seyler, Lubavin. Seyler; F. Meischer. Jaksch, 
__ > 
Analysis given 
in Hofmann’s 
“ Lehrbuch der 
Zooehemie,” 
C = 43-00 
48*50 
49’58 
r ^ 
36*11 50-60 50-50 
49-60 
H = 6-o6 
7 'i 5 
7*io 
5‘ 1 5 7*40 7-80 
7-00 
N = 15-31 
13-30 
15-02 
13-09 13-12 13-15 
14-00 
P «= 2-58 
4-60 
2-28 
9-59 2-08 171 
2-50 
0 = — 
26-45 
— 
36-06 — r- 
25-10 
S = — 
— 
— 
— 
i-8o 
Some of these 
authors write of 
a modification of “ 
nuclein,” 
insoluble in alkalies, 
in addition to the above. 
The fob 
lowing table shows 
forms of albumen - 
the percentage composition 
of some 
Albumen. 
Mucin. 
Gelatin. 
Fibrin. Syntonin. 
Lardacein, 
C 53*5 
52*4 
50-16 
527 54 ’ 1 
53-6 
H 7-0 
7-0 
6 - 6o 
6-g 7-2 
7-0 
N 15*5 
12-8 
18-30 
15-4 16-1 
15-0 
S i-6 
Nil. 
0-14 
1*2 I-I 
**3 
0 22'0 
27-8 
24-80 
2 3'5 21-5 
23-1 
If these figures be studied, side by side, with those attributed 
to “ nuclein,” it will be seen that the percentages of hydro- 
gen, nitrogen, and sulphur (where it occurs) in “ nuclein ” 
are precisely those which belong to various, and not unlikely 
impure, forms of albumen. Further, the phosphorus ranges 
in “ nuclein” between 171 and 9*59 per cent, while the 
carbon ranges between 36*11 and 50*60 per cent. As we 
shall proceed to further demonstrate that this “ nuclein ” is 
a form of albumen, we may at once explain the absence of 
sulphur in most of the preparations by the fadf that the 
authors heated them with caustic soda or potash, which 
would remove the sulphur from many forms of albumen : 
in faft this constitutes the method of preparation of alkali 
albuminate. As for the phosphorus, we contend that its 
presence proves but one thing, viz., the impurity of each of 
the above preparations containing it. How it exists there 
is also readily explained. Lecithin is a known constituent 
* Pfluger’s Arehiv., vol. xiii,, p, 469. 
