C. STOUT AND F. BOHORQUEZ 
857 
Figure 18. — ("Maud") Chimpanzee (Pan troglodytes). 
Twenty-year old female. 
A. Interlobular renal artery showing pseudoelastic 
hyperplastic sclerosis. VerhoefF van Geison stain x 
400. 
B. Marked intimal and medial proliferation in a 
renal afferent arteriole with ischemic atrophy of 
the supplied glomerulus. H & E x 160. 
C. Hyalinization of renal afferent arteriole. The nor- 
mal efferent arteriole is seen on the left. PAS x 
160. (Reproduced with permission from Exp. 
Molec. Path., Academic Press, New York). 
staffs at the Oklahoma City Zoo were also cru- 
cial to the success of the program. Mrs. Zelma 
Proctor is commended for the preparation of 
histologic sections of high quality. 
REFERENCES 
1. Clarkson, T. B., Prichard, R. W., Netsky, M. 0., 
and LoPLAND, H. B. Atherosclerosis in pigeons. Its' 
spontaneous occurrence and resemblance to human 
atherosclerosis. Arch. Path. 68:143-147, 1959. 
2. MiDDLETON, C. C, Clarkson, T. B., Lofland, H. B., 
and Pritchard, R. W. Atherosclerosis in the squirrel 
monkey. Naturally occurring lesions of the aorta 
and coronary arteries. Arch. Path. 78:16-23, 1964. 
3. McGiLL, H. C, Jr., Strong, J. P. Holman, R. L., 
and Werthessen, N. T. Arterial lesions in the 
Kenya baboon. Circ. Res. 8:670-679, 1960. 
4. Moreland, a. F., Clarkson, T. B., and Lofland, 
H. B. Atherosclerosis in "Miniature" swine. I. 
Morphologic aspects. Arch. Path. 76:203-210, 
1963. 
5. Malinow, M. R., and Marruffo, C. A. Aortic 
atherosclerosis in free-ranging howler monkeys. 
Nature, 206:948-949, 1965. 
6. Roberts, J. C, and Straus, R., Eds. Comparative 
Atherosclerosis. Harper and Row, New York, 
1965. 
7. Fox, H. Arteriosclerosis in lower mammals and 
birds : Its relation to the disease in man. In : Arter- 
iosclerosis, E. V. Cowdry, Ed., MacMillan, New 
York, 1933, p. 153-193. 
8. Ratcliffe, H. L., and Cronin, M. T. I. Changing 
frequency of arteriosclerosis in mammals and birds 
at the Philadelphia Zoological Garden. Review of 
autopsy records. Circulation 18:41-52, 1958. 
9. Vastesaeger, M. M., and Delcourt, R. The natu- 
ral history of atherosclerosis. Circulation 26:841- 
855, 1962. 
10. Finlayson, R. Spontaneous arterial disease in ex- 
otic animals. J. Zool. 147:239-343, 1965. 
11. Lindsay, S., and Chaikoff, I. L. Naturally occur- 
ring arteriosclerosis in animals: A comparison 
with experimentally induced lesions. In: Athero- 
sclerosis and Its Origin, M. Sandler and G. H. 
Bourne, Eds., Academic Press, New York, 1963, p. 
349-437. 
12. Dahme, E. G. Atherosclerosis and arteriosclerosis 
in domestic animals. Ann. N. Y. Acad. Sci. 
127:657-670, 1965. 
