1022 EXPERIMENT STATION RECORD. 



2,000,000 acres of land are infested. Fumigation with carbon bisulphid and the 

 use of l>aits poisoned with strychnin are recommended. 



A coli bacillus affecting the hamster, B. Galli-Valerio {CeniU. Bakt. u. Par., 

 1. AhL, 30 {1901), No. 7, pp.273-.?76, firjx. 2). — An infectious di.sease was observed 

 among hamsters which had been imported from Alsace in 1900. The disease caused 

 the death of a large proportion of infected animals within a few days. Animals 

 which died of the disease showed an enlargement of the liver, which was affected 

 by a complete fatty degeneration. Microscopic examination of the liver, spleen, and 

 blood revealed the presence of large numbers of bacilli which belonged to the coli 

 group. Detailed notes are given on the culture experiments conducted with these 

 organisms. Inoculation experiments with rabbits, guinea pigs, and chickens gave 

 negative results. Positive results, however, were obtained from experiments on mice. 



Studies on the bacillus pathogenic for rats, B. Issatschenko ( Cenibl. Bakt. u. 

 Par., 1. Abt., 31 {1902), No. 1, pp. 26-38). — The author made numerous experiments 

 on the bacillus, which was found to cause fatal infection in mice and rats but which 

 did not affect domesticated animals; cats, dogs, chickens, and pigeons were not 

 infected l)y eating food containing pure cultures of the bacillus. Feoktistoff carried 

 out similar experiments on horses, cattle, hogs, sheep, dogs, cats, and domestic 

 poultry, with similar results. None of the animals became infected or showed any 

 evidence of disease. In feeding experiments with the bacillus it was found that rats 

 and mice almost without exception became infected with a fatal disease. The death 

 rate was greatest 15 days after infection. Only 2.7 per cent of the rats and mice 

 upon which experiments were made resiste<l infection. 



The value of the bacillus of Danysz in destroying rats, G. Maekl ( C'entbl. 

 Bakt. II. I'm-., 1. Aht., SI {1902), No. 5, Orig., pp. 202-204). — Numerous experiments 

 were made for the purpose of comparing the effect of this bacillus with that of the 

 bacillus of mouse typhus. It was found that the serum of a rabbit which had been 

 inoculated subcutaneously with a sterilized culture of the Danysz bacillus agglutinated 

 the culture of this organism when a<lded in the proportion of 1 to 50, or 1 to 100 parts, 

 while it had no such effect on the culture of the bacillus of mouse typhus. It is 

 believed that the use of the Danysz bacillus in destroying rats offers only slight 

 advantages over chemical poisons. 



Comparative studies on the bacillus of Danysz, and a new organism patho- 

 genic to rats, iAI. Grimm {CeiUbl. Bakt. u. Par., 1. Abt., 31 {1902), No. 7, Oraj., pp. 

 286-293). — The behavior of these 2 organisms on various nutrient media, and their 

 pathogenic properties and resisting jiower to different chemical and physical agents, 

 are compared. The new organism de.scril)eil l)y the author proved to be very patho- 

 genic for rats, but experiments indicated that it was also pathogenic to some extent 

 for the larger domesticated animals. Its u.se, therefore, in combating rats on farms 

 or in the neighborhood of cities must be somewhat limited. 



The biology of the trypanosoma of rats, Jurge.vs {Arch. Hyg., 42 {1902), 

 No. 3, pp. 265-288). — The material witli which the author made his experiments was 

 obtained from 2 wild gray rats which were thoroughly infested with trypanosoma. 

 It was found possible to transmit the parasites to white rats, in all of the 47 tests 

 which were made. A small quantity of blood was taken from the candal vessels of 

 the infected rats, mixed with an equal quantity of normal salt solution, and injected 

 into the peritoneal cavity of the experunental animals. The demonstration of the 

 parasites in the blood of the inoculated animals was possible after 3 or 4 days. The 

 incubation period, during which it was not possible to find the jiarasites, varied some- 

 what according to the amount of material which was used for inoculation purposes. 

 The incubation period is also much affected by the developmental stage of the para- 

 sites. If the blood which is used for inoculation contains larval parasites, the period 

 of incubation is only 1 or 2 days. 



Annotated list of the birds of Oregon, A. R. Woodcock {Oregon Sla. Bui. 68, 



