390 EXPERIMENT STATION RECORD. 



eacU 100 lbs. of tlie animal's weight, given daily for 10 days before ticks are allowed 

 to get on the cow. will not prevent the animal from taking Texas fever. The injec- 

 tion of a moderate amount of serum for 10 days, beginning the treatment about the 

 time the animal becomes infested with ticks, does not prevent the development of 

 Texas fever. The injection of a large quantity of serum after the fever has devel- 

 oped does not influence the temperature of the animal." 



Acclimation fever, or Texas fever, J. C. Robert (Mississippi Sta. 

 Bui. 42, pp. 32, figs. i). — Texas fever is discussed and the fact pointed 

 out that so far as is known the only natural means of infecting cattle 

 with this disease is the cattle tick. The cattle tick is described at some 

 length. Quarantine regulations against Texas fever and the value of 

 dipping cattle are discussed at some length. 



A number of experiments were made with bload serum as a prevent- 

 ive and cure for Texas fever. The serum used in the experiments was 

 obtained from southern cows well covered with ticks. The blood was 

 taken from the jugular vein and collected in sterilized jars. After 

 standing for 3G hours on ice the serum was drawn off in sterilized glass 

 bottles. A small amount of serum was also prepared from a southern 

 cow free from ticks. Tests were made to determine the efficiency of 

 inoculation (1) before shipping cattle South, (2) before shipping and 

 after reaching the South, (3) using serum from cattle with and without 

 ticks on them, (4) with serum from cows sick with Texas fever, and (5) 

 with tick juice. The various experiments are described in detail. 



"The results of the experiments indicate unmistakably that the blood serum 

 inoculation as we practiced it had no effect either in preventing or curing Texas 

 fever. Our experiments furnish us additional evidence, however, that the cattle tick 

 is the agent for transmitting the disease, and that valuable breeding animals can be 

 brought South at any time with little danger of contracting 'acclimation' fever, 

 provided they are kept free from ticks by placing in uninfected inclosures. Such 

 animals should be regularly and carefully examined for ticks and the legs and soft 

 skin of the body occasionally oiled." 



The author is of the opinion that there is no toxin produced by the 

 Texas-fever germ. 



The typhoid serum diagnosis, H. L. Bolley (Forth Dakota Sta. 

 Bpt. 1897, pp. 30-43, fig. 1).— The author gives a popular account of the 

 subject, briefly mentioning the work of a number of investigators. 

 Original investigations are also reported on the effects of typhoid serum 

 upon the bacilli, the variation in condition as affecting the reaction, the 

 use of the reaction in water analyses, and the source of reaction serum 

 for the last purpose. The effects of the serum upon bacilli as seen under 

 the microscope are described in some detail. 



Experiments made during 1895-9G on the bacterial content of milk 

 in the udder are noted. The following conclusions were drawn: The 

 number of germs in the same udder varies at different times. The 

 number varies on the same day in the different teats of the same udder, 

 and on the same date for different udders. The number of different 

 species present is also found to vary, and there is little constancy of 



