Fig. 3. A longitudinal section of the femur, exhibiting the structure of an exostosis.

a. The compact and healthy cylindrical part of the bone.

b. The appearance of the enlarged part upon the external surface.

c. The surface towards the medullary cavity of the bone.

Fig. 4. A longitudinal section of the tibia, magnified; to shew the mode of attachment between a superficial deposit of ossific matter, and the natural surface of the bone.

}

a. The natural surface of the tibia.

b. The super-imposed lamina of ossific matter.

Fig. 5. The surface of the superficial deposit, magnified to the same degree as the last figure. Upon this figure the numerous foramina passing through the new structure are accurately seen, and the peculiar characters of the surface also are sufficiently apparent.

PLATE III.

Fig. 1. Shews on a reduced scale the appearance of a very fine specimen of foliated ossific tumor upon the femur.

a. The healthy part of the femur.
b. The condyles of the femur.
c. The ossific tumor.

d. The part of the bone, where, from the immediate vicinity of the irritation of the disease, the external surface has been not only disturbed, but entirely removed.

e. The part immediately beyond, where the diminished effect of irritation, instead of inducing absorption, has been the means of exciting a new ossific secretion upon the natural surface of the bone.

Fig. 2. Exhibits on a reduced scale the appearance of a tumor of the same description with the above. The minute structure of the disease is similar to that of the former preparation, but the general character of the disease was all that it appeared essential to represent.

a. The healthy part of the cylinder of the femur.

b. The condyles of the femur.

c. The ossific tumor.

AN INQUIRY

INTO THE ORIGIN AND NATURE

OF THE

YELLOW FEVER,

AS IT HAS LATELY APPEARED IN THE WEST INDIES,

WITH

OFFICIAL DOCUMENTS

RELATING TO

THIS SUBJECT.

BY WILLIAM FERGUSSON, M.D.

INSPECTOR OF HOSPITALS, AND PRINCIPAL MEDICAL OFFICER IN THS LEEWARD AND WINDWARD ISLANDS.

Read March 18, 1817.

As an introduction to the subject, which I propose to discuss in the present communication, I shall beg leave to premise the following queries, which were put by the Army Medical Board, in consequence of the great sickness and considerable mortality that prevailed on board some ships, conveying black recruits from Goree to the West Indies.

NATURE AND ORIGIN OF THE YELLOW FEVER. 109

Barbadoes, October, 1816.

Queries relative to the Regalia Transport, which sailed with black recruits from the coast of Africa, for the West Indies, in 1815.

1. Was the ship good and her crew healthy before the blacks were embarked?

2. What was the state of the black recruits? Who inspected them previously to embarkation? and from whence did they come?

1. The ship was good and her crew healthy, until she took on board

large quantity of green wood, a very short time before the blacks were embarked.

2. Many were embarked sick from hospital, with ulcers, fluxes, &c. It is supposed they were inspected by the surgeon who had been appointed to accompany them, but did not, on account of sickness. No account can be obtained of the tribes or nations to which they belonged, previous to their capture at sea, or their being brought to Sierra Leone.