526 Trans. Acad. Sci. of St. Louis. 
Inorganic Chemistry that barium sulphate were precipitable 
out of its solution in water by hydrochloric acid, the error 
could not have been more inexplicable than the one com- 
mitted by Dr. Ewald. Syntonin and all of the other so- 
called derived albumins and albuminates possess the indispu- 
table properties of being insoluble in water, salt solutions and 
alcohol but soluble in dilute acids or alkalies, of not 
being coagulated while in solution at any temperature 
whatever, be it 70° or 212°, and finally of being precipi- 
table by careful neutralization. The neutralization-precip- 
itate (Mulder’s protein?) is indeed coagulable at 70°, 
when suspended in water or any other neutral medium. 
If the series of lectures which Dr. Ewald’s book is a compila- 
tion of, had been held before a body of physiologists, this 
lapsus could never have been perpetuated in printer’s ink. 
But the very fact of their having been delivered before an 
assembly of practicing physicians, renders the error the 
more flagrant, as the statements coming from such oracular 
authority, are not apt to be called in question, particularly 
if they refer to matters of a purely physiological or physio- 
logico-chemical nature. Looking over the first part of Dr. 
Ewald’s ‘* Klinik’? (Die Lehre von der Verdauung), I fail to 
find the slightest allusion made to any new experimental evi- 
dence, bearing out the stand taken by him with regard to the 
properties of acid albumin or syntonin. In the next revised 
edition of Dr. Ewald’s work, we may justly hope to find an 
explanation for his attitude, or to have him acknowledge his 
mistake with a graceful «* pater, peccavi! ”’ 
The method which I have adopted for separating the differ- 
ent members belonging to the family of proteids, is grounded 
on the results of the experimental work of the best observers © 
in this special line. To prove that it is a working method, I 
give it in extenso: 
1. Boil the filtered stomach contents. 
Turbidity shows the presence of native proteids Se 
globulins). 
Filter. 
2. Test the reaction of the filtrate with litmus paper; if 
acid, neutralize exactly, using as indicator, litmus or turmeric 
