170 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1962 



In spite of the previous points, the histopathological and microbio- 

 logical studies to date on these monkeys seem to support the premise 

 that the condition is not infectious but probably toxic. At this time 

 the possibility of lead poisoning cannot be completely ruled out. 



Parasites. — Identification of parasites from the animal collection 

 was made by the Beltsville Parasitological Laboratory of the U.S. 

 Department of Agriculture. The nematodes, acanthocephalids, and 

 linguatilids were identified by M. B. Chitwood; trematodes, ticks, and 

 mites by Dr. A. Mcintosh ; and cestodes by W. W. Becklund. 



Bactenology. — Tuberculosis was found to be the cause of death in 

 four animals, two bighorn sheep, a female wisent, and an aged female 

 gaur. The infections in the bighorn sheep and the gaur were classi- 

 fied as the bovine type of organism by Dr. A. G. Karlson, of the Mayo 

 Clinic, Rochester, Minn. 



Dr. J. R. Wadsworth of the Department of Animal Pathology of 

 the University of Vermont continued to assist the Zoo with his inter- 

 pretation of suspected tumor tissues from the collection. 



Whenever possible, hearts and large vessels of necropsy specimens 

 are saved for Dr. Thomas Perry, of the George Washington Uni- 

 versity School of IMedicine, for his study of comparative pathology 

 of these organs. 



Dr. F. E. Lucas, director of the Livestock Sanitary Laboratory, Cen- 

 treville, Md., provided clinical laboratory services and microscopic 

 tissue reports. 



Dr. K. F. Meyer, of the George Williams Hooper Foundation of 

 the University of California, assisted the Park by determining the 

 complement fixation titers of quarantined psittacine birds to the 

 psittacosis antigen. He also advised the Park on a feeding and treat- 

 ment regimen for all quarantined birds. 



Blach-'bea.r project. — At the request of the National Park Service, a 

 field trip was made to the Great Smoky Mountains National Park in 

 early August 1961 to instruct park personnel in the use of the Cap- 

 Chur equipment. Each year in several of the National Parks "rogue" 

 bears cause personal injuries to visitors and thousands of dollars in 

 property damage. Usually the park personnel know the individual 

 troublesome bears by sight, but the culvert trap method of removing or 

 translocating the bear is not always successful. Furthermore, a trou- 

 blesome bear once trapped and returned is most likely to be trap shy. 

 During approximately 6 days of field work, 20 free-ranging American 

 black bears were injected, using the Cap-Chur equipment. Five indi- 

 viduals were underdosed and did not react to the drug ; one syriuge 

 did not inject because of mechanical difficulties ; and two bears escaped 

 from the area during the latent period of the drug and so it could not 

 be determined whether the dose was effective. Five bears were immo- 



