107 



the probability of their being found at all. That is to say, as the result 

 of microscopic examination of the milk of these cows, which were tuber- 

 culous but showed no marked signs of disease of the udders, it appeared 

 that the milk of more than one fourth of the cows and more than one 

 seventh of all the samples of milk contained the bacilli of tuberculosis. 

 Other interesting facts shown by the experiments are that the cream 

 after rising is quite as likely to be infectious as the milk j the bacilli are 

 present with a fair degree of constancy ; the bacilli if present at all in 

 the udder are not washed out entirely in the tirst part of the milking, 

 but may be i)resent in any portion of the milk, and even after the 

 milking, the bacilli may be supposed to be i)retty evenly distrll)uted in 

 all parts of the udder. 



Inoculation experiments were made with rabbits and guinea-pigs. 

 The milk of seven cows out of the fourteen used for the purpose was 

 thus shown to be infectious. Microscopic examination of material from 

 calves fed on mdk from cows aftected with tuberculosis, revealed infec- 

 tion in five out of twelve cases in which positive results were obtained. 

 In similar experiments with pigs results showing infection were ob- 

 tained in two out of five cases. 



Tiie following conclusions are drawn at this stage of the work : " (1) 

 Emphatically, that the milk from cows aftected with tuberculosis in 

 any part of the body may contain the virus of the disease. (2) That 

 the virus is present whether there is disease of the udder or not. (3) 

 That there is no ground for the assertion that there must be a lesion of 

 the udder before the milk can contain the infection of tuberculosis. (4) 

 That, on the contrary, the bacilli of tuberculosis are present and active 

 in a very large proportion of cases in the milk of cows affected with 

 tuberculosis but with no discoverable lesion of the udder." 



Massachusetts Hatch Station, Special Bulletin, May, 1890 (pp. 44). 



On the most profitable use of commercial manures. — A 

 translation by Prof Charles Wellington of an article hy Prof. Paul 

 Wagner, director of the agricultural experiment station at Darmstadt, 

 Germany. 



Michigan Station, Bulletin No. 60, April, 1890 (pp. 10). 



Feeding pigs of different breeds, E. Davenport, M. S. (pp. 

 3-7). — This experiment was a duplicate of a similar test made at the 

 college in 1888, '' which was undertaken at the request of leading breed- 

 ers, with a hope that it would give some evidence as to the comparative 

 value of some of our breeds of swine for pork production." Two bar- 

 row pigs of each of the Duroc Jersey, Berkshire, and Poland-China 

 breeds were fed one hundred and sixty-eight days, from July 16, 1889, 

 to December 31, 1889. The food consisted of " equal parts of corn and 

 oats ground together and mixed with twice its weight of fine middlings," 



