Nag ana. Tsetse Fly Disease. 641 



copperas, etc. Smear the skins of the animals with tar water, 

 coal tar water, naphthalin, daily if necessary to prevent the at- 

 tacks of the flies. Other suggestions in this line can be found 

 under parasites. 



An important consideration would be to seclude every animal 

 attacked with surra. The flies can only carry and inoculate the 

 poison when there is some source from which they can obtain it. 

 Until we shall learn how many animals^ tame and wild, casually 

 contract the Trypanosoma Evansi we cannot speak of how 

 effective this may be made, but it is at least a substantial advance 

 in the line of restriction, since the infected horse or mule in the 

 vicinity of healthy ones is a constant peril, and as given insects 

 attack by preference, given favorite genera, the horse flies, coming 

 from the diseased animal are much more likely than other flies to 

 attack the sound horses. In a surra season it would be a wise 

 economy to destroy the infected equine at once, as according to 

 all past experience, sentence of death has already been passed 

 upon him, and his preservation even for an hour is hopeless for 

 him, but full of the gravest danger for others. The carcass and 

 all pertaining to it, blood especially, should be promptly and 

 deeply buried and the place thoroughly disinfected. 



In the same way smudges made by burning green grass or 

 other vegetation, tar, leather or other material producing empy- 

 reumatic products, offensive to the fly may be employed. 



Sanitary Police. The Department of Agriculture forbids the 

 landing in the United States or its dependencies of any animal 

 from the Phillipines. If the infection should by any accident be 

 imported no cost should be considered too high to secure a prompt 

 and thorough extinction of it. 



NAGANA. TSETSE FLY DISEASE. 



Trypanosoma Brucii : attacks horse, ass, mule, cattle, buffalo, antelope, 

 camel, hyena, dogs, etc. Elephants and zebra, pigeon and hen immune. 

 Tsfetse fly. Inoculation only certain channel ; virulence in dead body 24 

 hours ; in vitro 3 to 4 days, or when dried or heated (122° F. ) Symptoms : 

 hyperthermia ; anaemia ; leucocytosis ; buflfy coat ; oedemas ; catarrhs ; wast- 

 ing ; debility. Lesions : as in surra ; trypanosoma in blood at intervals, 

 bone marrow, lymph glands, spleen. Immunizing unsuccessful. Preven- 

 tion as in surra. 

 4^ 



