162 NEW YORK ZOOLOGICAL SOCIETY. 
of cartilage cells, while the centers are made up of diffuse hyaline 
tissue containing only occasional cells, a few fibers and an occa- 
sional spicule of incompletely calcified tissue (plate 6, Fig. A). 
Many of the cartilage cells in these areas show karyokinetic fig- 
ures and cell division is evidently actively taking place. The 
spaces of the cancellous portion of the bone are for the greater 
part completely occupied by mucoid tissue, in places containing 
few cells mostly resembling embryonic connective tissue cells, with 
a few scattering leucocytes and plasma cells (plate 6, Fig. B). In 
other places the homogenous matrix of mucoid tissue is densely 
infiltrated with cells of many types, polynuclear leucocytes, many 
of which are eosinophiles, normoblasts, megaloblasts, osteoclasts, 
of particularly large size, and small round cells with occasional 
plasma cells. These cellular areas are particularly frequent about 
the walls of the blood vessels. Newly formed blood vessels are 
frequent. Pigmentation, as from broken-down red blood cells, 
is found in a few areas where apparently small extravasations 
from the new vessels has taken place. 
In the preparation of this bone for microscopic examination but 
slight decalcification was necessary, and before this was begun 
the bone could be easily compressed between the fingers. 
CASE Ix. 
Diana Monkey (Ceropithecus diana).—In this case the paral- 
ysis of the posterior extremities was early manifested. Animal 
continued to take its food well up to within day of death. Super- 
ficial ulcerations developed on several parts of hind limbs. Ema- 
ciation or atrophy not excessive in this case. 
POST-MORTEM SUMMARY. 
Body.—Moderately emaciated. | Heart.—Systole, normal. 
Lungs.—Bronchitis. Liver—Congested. Kidneys Congested. 
Spleen and Lymph Nodes.—Anaemic. Stomach and Intestines.— 
Contained--considerable partially digested food; mucous mem- 
branes anaemic. Genito-Urinary Tract.—Negative. Osseous 
System.—Marked changes in all the bones. Soft and easily 
broken. Thorax and pelvis greatly distorted. Vertebrae easily 
cut. 
Membranes—Both the dura mater and the pia are thickened 
throughout their entire course, the thickening being in adult con- 
