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PUS. 363
The synovia of new-born babes corresponds to that of resting animal-.
The fluid of the bursae mucosae, as also the fluid in the synovial cavities
around joints, etc., is similar to synovia from a qualitative standpoint.
III. PUS.
Pus is a yellowish-gray or yellowish-green, creamy mass of a faint
odor and an unsavory, sweetish taste. It consists of a fluid, the pus-
serum, in which solid particles, the pus-cells, swim. The number of these
cells varies so considerably that the pus may at one time be thin and at
another time so thick that it scarcely contains a drop of serum. The
specific gravity, therefore, may also greatly vary, namely, between
1.020 and 1.040, but ordinarily it is 1.031-1.033. The reaction of fresh
pus is generally alkaline, but it may become neutral or acid from a decom-
position in which fatty acids, glycerophosphoric acid, and also lactic
acid are formed.
In the chemical investigation of pus, the pus-serum and the pus-
corpuscles must be studied separately.
Pus-serum. Pus does not coagulate spontaneously nor after the
addition of defibrinated blood. The fluid in which the pus-corpuscles
are suspended is not to be compared with the blood-plasma, but rather
with the serum. The pus-serum is pale yellow, yellowish-green, or brownish-
yellow, and has an alkaline reaction toward litmus. It contains, for the
most part, the same constituents as the blood-serum; but sometimes
besides these—when, for instance, the pus has remained in the body
for a long time—it contains a nucleoalbumin or a nucleoprotein which
is precipitated by acetic acid and is soluble with great difficulty in an
excess of the acid (pyin of the earlier authors). This nucleoalbumin
seems to be formed from the hyaline substance cf the pus-cells by macera-
tion. The pus-serum contains, moreover, at least in many cases, no
fibrin ferment. According to the analyses of Hoppe-Seyler l
the pus-
serum contains in 1000 parts:
i. ii.
Water 913.70 905.65
Solids 86 . 30 94 35
Proteins 63.23 77 21
Lecithin 1 . 50 . 56
Fat 0.26 0.29
Cholesterin . 53 . 87
Alcohol extractives 1 . 52 . 73
Water extractives 11 . 53 6 . 92
Inorganic salts 7 . 73 7 . 77
1
Med.-Chem. Untersuch., 490.
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