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546 TISSUES OF THE CONNECTIVE SUBSTANCE.
In regard to the mineral bodies it must be remarked that according
to the determinations of H. Schulz the connective tissue is rich in silicic
acid. The greatest amount was found by him, in the crystalline lens
of the ox, namely, 0.5814 gram per kilo of dried substance. In man he
found 0.0637 gram in the tendons, 0.1064 gram in the fascia, and 0.244
gram in Wharton’s jelly for every kilo of dried substance. The quantity
of silicic acid is higher in the young than in the old; in man it is highest
in the embryonic connective tissue of the umbilical cord. In the last-
named substance Schulz also found 0.403 gram FeoOs, 0.693 gram
MgO, 3.297 grams CaO, and 3.794 grams P2O5 for every kilo of dried
substance. The report of Schulz on the quantity of silicic acid does
not correspond with the investigations of Frauenberger 1
who found,
in Wharton’s jelly, only a fraction of the quantity of silicic acid that
Schulz gives.
H. CARTILAGE.
Cartilaginous tissues consist of cells and an original hyaline matrix,
which, however, may become changed in such wise that. there appears
in it a network of elastic fibers or connective-tissue fibrils.
Those cells that offer great resistance to the action of alkalies and
acids have not been carefully studied. According to earlier opinions
the matrix was considered as consisting of a body analogous to colla-
gen, so-called chondrigen. The investigations of Morochowetz and
others, but especialty those of C. Morner,2
have shown that the
matrix of the cartilage consists of a mixture of collagen with other
bodies.
The tracheal, thyroideal, cricoidal, and arytenoidal cartilages of
full-grown cattle contain, according to Morner, four constituents in
the matrix, namely, chondromucoid, chondroitin-sulphuric acid, collagen,
and the albumoid.
Chondromucoid. This body, according to C. Morner, has the com-
position C 47.30, H 6.42, N 12.58, S 2.42, O 31.28 per cent. Sulphur is
in part loosely combined and may be split off by the action of alkalies,
and a part separates as sulphuric acid when boiled with hydrochloric
acid. Chondromucoid is decomposed fay dilute alkalies and yields alkali
albuminate, peptone substances, chondroitin-sulphuric acid, alkali sul-
phides, and some alkali sulphates. On boiling with acids it yields acid
albuminate, peptone substances, chondroitin-sulphuric acid, and on
1
Schulz, Pfluger’s Arch, 84 and 89, 131 and 144; Frauenberger, Zeitschr. f. physiol.
Chem., 57.
1
Morochowetz, Verhandl., d. naturh. med. Vereins zu Heidelberg, 1, Heft 5; Morner,
Skand. Arch. f. Physiol., 1.
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