242 ANNUAL EEPOKTS OF DKPAKTMENT OF AGRICULTURE. 



antine until their freedom from trypanosomiasis is definitely 

 established. 



The discovery of trypanosomiasis in this importation of camels 

 emphasizes the importance of the bureairs quarantine and laboratory 

 service in keeping out of this country diseases such as surra, which, 

 if it gains a foothold, is likel}' to cause inestimable losses to the live- 

 stock industry. 



AUTOPSIES ON WILD ANIMALS. 



The carcasses of 27 birds and 33 mannnals were received from the 

 National Zoological Park for post-mortem examination. Of the 

 bii'ds, 3 were affected with aspergillosis, 2 with tuberculosis, 1 with 

 congestion of the lungs, G with enteritis, 2 with gastritis, 1 with 

 gastroenteritis, 1 with lead poisoning, and 11 with undetermined 

 afi'ections. Of the mammals, 4 were affected with tuberculosis, 2 

 with anemia, 4 with enteritis, 1 with gastritis, 4 with gastroenteritis, 

 1 Avith goiter, 2 with internal hemorrhage, 9 with necrobacillosis, 2 

 with pneumonia, 1 with pleurisy, 1 with pyemia, and 2 Avith dissemi- 

 nated tumors. 



An affection commonly called jaAv disease has existed for some time 

 among the kangaroos kept at the National Zoological Park. Tliis 

 year the disease appeared in particularly virulent form and 9 animals 

 died. A study of these cases revealed the presence of Actinoviyces 

 necrophorus in all of them and led to a diagnosis of necrobacillosis. 



TESTING BIOLOGICAL PRODUCTS. 



The testing of commercial veterinary biological products prepared 

 under Government licenses, as well as of the cultures from Avhich 

 they were prepared, has been continued, Avith samples submitted 

 through the Division of Virus-Serum Control, in connection Avith 

 the enforcement of the virus-serum-toxin law. Samples of 47 prod- 

 ucts Avere examined, of which 9 Avere found to be unsatisfactory by 

 reason of lack of potency or contamination. There were also ex- 

 amined 141 cultures, of Avhich 15 Avere found to be unsatisfactor3\ 



INVESTIGATION OF POISONOUS PLANTS. 



Investigations of poisonous plants and their effects on livestock 

 have been continued along the same general line as in the last feAV 

 years. The field experiments have been carried on almost entirely 

 at the experiment station on the Fishlake-Fillmore National Forest, 

 near Salina, Utah. It has been shoAvn to be entirely feasible to use 

 in feeding experiments at this place dried plant material from other 

 localities, in addition to the plants Avhich are available in the imme- 

 diate A'icinity. 



An investigation of losses from eating lupine on the Glenwood 

 division of the Fillmore National Forest was made in the summer of 

 1922, and a survey of a poison area in the Weiser National Forest 

 was made in the spring of 1923. In the latter case there seemed to 

 be no doubt that the loss Avas caused by Avild cherry and death 

 camas, and Avas occasioned by the fact that the sheep were obliged 

 to pass over a driveAvay Avhere there Avas little to eat except these 

 injurious plants. 



The woolly-pod milkweed, Asclepias ericarpa, growing in Califor- 

 nia, has been shown to be very poisonous, and its characteristics have 



