204 
BRITISH PHARMACEUTICAL CONFERENCE. 
loids, and inversely to its colloid constituents, and these may be separated by 
the process of dialysis. In connection with this we may state that the hygro¬ 
scopic properties of the extract bear some relation to the amount of crystal¬ 
loids contained in the samples, as we have found the specimens containing the 
most gelatinous matter keep their consistence best when freely exposed to 
the air; but of course the rate of deliquescence depends on the state of the 
atmosphere. 
Thirdly, that in a comparative way the proportion of gelatinous constitu¬ 
ents may be readily estimated by a solution of tannic acid. 
Any value which these results may have is relative rather than absolute. 
Our object has been to obtain, if possible, a ready means of testing a complex 
product otherwise difficult to deal with, rather than to investigate details 
which could only be worked out fully by those who have time and opportuni¬ 
ties we cannot command. There are many amongst our members who have 
both leisure and ability : to them we commit the subject, as one that will 
repay their labour. 
Finally, we must acknowledge the kind assistance of our friends Dr. Attfield 
and Mr. A. Freire-AIarreco : of the former in our early experiments in dia¬ 
lysis, of the latter in many matters connected with the more purely chemical 
portions of the subject. 
INDEX TO PLATES. 
Fig. 1. 
„ 2 . 
V 
55 
55 
55 
55 
55 
3. 
4. 
5. 
6 . 
7. 
8 . 
9. 
5 ) 
10 . 
11 . 
55 
12 . 
Acid Orthophosphate of Potash. 
a. Crystallized from aqueous solution. 
b. Crystallized from aqueous solution, in which a little vegetable ex¬ 
tractive had been dissolved in order to observe the influence of 
viscid matter on the forms of the crystals. 
Chloride of Potassium. 
a. Crystals from aqueous solution. 
b. Crystals from alcoholic solution. 
c. Crystals from alcoholic solution, in which a small portion of vege¬ 
table extractive had been dissolved. 
Kreatine, after Funke. ^ 
Kreatine, from specimens. 
Extractum Carnis, prepared as an experiment with cold water. 
Extractum Carnis, prepared with hot water. 
Extractum Carnis, Harvey and Keynolds. 
“ Extract of Meat Lozenges.” 
a. Portion insoluble in alcohol. 
b. Alcoholic solution evaporated. 
Cold water Extract as Fig. 5. 
a. Portion insoluble in alcohol. 
b. Portion soluble in alcohol. 
Australian Extract. 
a. Portion insoluble in alcohol. 
b. Portion soluble in alcohol. 
Prof. Pettenkofer’s Extract. 
a. Portion insoluble in alcohol. 
b. Portion soluble in alcohol. 
South American Extract. 
a. Portion insoluble in alcohol. 
b. Portion soluble in alcohol. 
Mr..STODDART thanked the authors of this paper for their further elaborate contribution 
to micro-chemical science. He was struck with the absence of lactates amongst the 
salts indicated as being found. Their detection did not appear to him to be difficult. 
He had successfully sought for it in the liquid derived from perspiration. 
