120 AREOLAR TISSUE. 
gelatine from it by boiling, none at least which has the pro- 
perty of gelatinizing. The integument was removed from a 
pig’s foetus measuring four inches in length, cut up into pieces, 
and steeped in distilled water for a day. It was then boiled 
for twenty-four hours. The last process caused it to crumble 
into small particles that clouded the fluid, in which also some 
large lamellz of epidermis floated. When examined with the 
microscope the epidermis exhibited the same structure as it 
did previous to being boiled ; the nuclei in the separate cells 
were also distinct. A quantity of fibre-cells floated in the fluid 
in the same state as when they, in their recent condition, com- 
posed the entire cutis, that is to say, longish corpuscles extended 
at both extremities into somewhat long fibres. The cell-nucleus 
could still be distinctly recognized in some of them. Thus 
the process of boiling, which had not produced any effect upon 
the fibre-cells or the fibres issuing from them, had dissolved 
the connecting cytoblastema, by which they had been held 
together in the recent state. The fluid was then filtered. 
Acetic acid caused a precipitate which was not dispersed by an 
excess of acid. <A solution of alum produced a much more 
copious precipitate, which, in like manner, was not redissolved 
by an excess of alum, or at least not completely. Tincture 
of gall-nuts caused a thick clouding, spirits of wine only a 
slight-one | Hydrochloric acid clouded the fluid, and an 
excess of acid did not render it clear again. These reactions 
accord with what Giiterbock has called pyine, save that the 
clouding produced in the latter by hydrochloric acid, was 
redissolved by an excess of the acid. <A portion of the filtered 
fluid was evaporated almost to dryness, but even after twenty- 
four hours, there was no trace of the formation of a jelly 
observable. In order to separate the component particles of 
this, in all probability, still very heterogeneous fluid, in some 
degree from one another, some pure alcohol was added to that 
portion of it which had been so long evaporated, whereby a 
very copious precipitate was produced. This was separated by 
filtration and washing, first with pure alcohol, and afterwards 
with spirits of wine of 80 per cent. strength, then dried, and 
again dissolved in boiling water. Acetic acid and alum caused 
precipitates in this solution, which were not again dissolved 
