190 EXPEEIMENT STATION RECORD. 



regions are not isolated by division fences into separate areas, and it is 

 therefore necessar}- that dipping should be regulated by some central 

 authority. 



Among the dipping materials considered by this author, the follow- 

 ing may be mentioned: A white arsenic dip made b}^ boiling 4.5 lbs. 

 of arsenic and 45 lbs. of carbonate of soda crystals in 2i gal. of water. 

 This to be dissolved in water at the rate of 2 lbs. to 100 gal. Sulphur 

 in the insoluble form of flowers of sulphur is recommended as an 

 effective dip. In order that sulphur may be more evenly distributed 

 in the dip, it is reconunended that an equal weight of soft soap be added. 

 Tobacco is recommended in a dip made as follows: 100 lbs. of drj" leaf- 

 tobacco, 10 lbs. of blue vitriol, 15 lbs. of common salt, and 2 lbs. of oil 

 of turpentine. Carbolic acid has also been found effective in killing 

 living parasites, but it is dangerous if used in a strength sufficient to 

 kill the eggs. Pitch oil is not recommended on account of the injurious 

 effects which it has upon the wool. 



The author makes the following recommendations regarding dip- 

 ping: The dipping- season should be from the first of June to the mid- 

 dle of November. Counties should be subdivided into areas in which 

 all sheep may be dipped within a period of 15 days, a second dipping- 

 to take place between the fifth and fourteenth day after the first dip- 

 ping. Inspectors should be appointed by the Board of Agriculture 

 and no sheep should be removed from one area to another during the 

 dipping season without being dipped immediately before removal. 

 All railway trucks and pens in public markets should be thoroughly 

 disinfected. Dipping tanks should be provided, the total cost being 

 met by the sheep owners. Late autumn dipping is more generally 

 practiced than spring dipping and is most effective. It is especially 

 desirable also from the fact that Melophagns ovrnvs is killed along 

 with the scab mite. Spring dipping is desirable where the fall dip- 

 ping has not proved successful, and is usually more or less effective 

 in destroying the grass ticks of the genus Ixodes, and thereby pre- 

 venting louping-ill. 



Swine plague, P. Fischer and A, T. Kinsley {Kansas Sta. Bui. 

 9L pp. 18). — The veterinary department of the station is conducting 

 experiments in protective inoculation against swine plague. At- 

 tenuated cultures of Bacillus suis were used as prepared by H. J. 

 Detmers. 



A college herd of ISl pigs had been bought from different localities 

 and was divided into 2 lots containing 114 and 320 respectively. Lot 

 1 was inoculated July 11, 1899. Lot 2 was inoculated August 11 of 

 the same vear. On July 24, or 13 days after the inoculation of lot 1, 

 the pigs began to die of swine plague and continued to die until Octo- 

 ber 8, when only 7 pigs remained out of the 114. On August 19, or 8 



