OF

ANATOMY AND SURGERY.

EDITED BY

LEWIS S. PILCHER, M.D., GEORGE R. FOWLER, M.D.,

CONTRIBUTORS

TO VOLUME VII.

O. H. ALLIS, M.D., OF PHILADELPHIA.

E. ANDREWS, M.D., LL.D., OF CHICAGO, ILL.
L. BAUER, M.D., M.R.C.S., Eng., of St. Louis, Mo.
E. H. BRADFORD, M.D., OF BOSTON, MASS.

W. T. BRIGGS, M.D., OF NASHVILLE, TENN.

G. J. FISHER, M.D., OF SING SING, N. Y.

G. R. FOWLER, M.D., OF BROOKLYN, N. Y.
S. KETCH, M.D., OF NEW YORK.

J. L. LITTLE, M.D., OF NEw York.

H. O. MARCY, M.D., OF BOSTON, MASS.

T. M. MARKOE, M.D., OF NEW YORK.
W. M. MASTIN, M.D., OF MOBILE, ALA.
C. Mc BURNEY, M.D., OF NEW YORK.
C. B. NANCREDE, M.D., of PhiladelphIA.
R. PARK, M.D., OF CHICAGO, ILL.

G. A. PETERS, M.D., OF NEW York.

J. E. PILCHER, M.D., OF BROOKLYN, N. Y.

L. S. PILCHER, M.D., OF BROOKLYN, N. Y.
D. PRINCE, M.D., OF JACKSONVILLE, ILL.

A. L. RANNEY, M.D., OF NEW YORK.
H. D. SCHMIDT, M.D., OF NEW ORLEANS.

R. WINSLOW, M.D., OF BALTIMORE.

ANNALS

OF

ANATOMY AND SURGERY.

ON THE FORMATION AND CONSTRUCTION OF A SACCIFORM ANEURISM OF THE

ARCH OF THE AORTA.

By H. D. SCHMIDT, M.D.,

OF NEW ORLEANS,

PATHOLOGIST TO THE CHARITY HOSPITAL OF NEW ORLEANS.

IN

N the last February number of this journal a certain observation was published, which I had made on the mode of formation of the fibrinous clot of a sacciform aneurism of the femoral artery, and which led me to regard the current theory of the aneurismal clot being formed by regular concentric layers of fibrin as incorrect. This conclusion, as may be remembered, was based upon the results obtained from the macroscopical and microscopical examination of a number of sections, made from the hardened clot, which showed that the fibrinous layers were not deposited in a strictly concentric manner, but appeared to overlap one another; and furthermore, the layers, themselves, appeared in their transverse sections to be composed of a number of ridges. The observation of these facts induced me to suppose the formation of the fibrinous clot to take place in the following