874 EXPERIMENT STATION RECORD. 



of hot nir. The drying of milk over heated revolving cylinders occupied an in- 

 termediate place. 



In each of the three methods of treatment there was a stage at which the 

 reduction in the total numher of bacteria was much greater than that observed 

 in the finished article ready for sale. The increase in the number of bacteria 

 observed during the tinal state is ascribed to recontamination. 



" The reduction in the total number of l)acteria was almost entirely due to the 

 death of streptococci, staphylococci, sarcinje, bacilli of the Bacillus coli type, 

 streptothrixes, yeasts, etc. 



"At none of the stages of preparation was the milk ever found completely 

 sterile. The amount of heat to which the milk was submitted was insufficient 

 to bring about the death of several .saprophytic and of some pathogenic bacteria. 

 Among the saprophytic bacteria which were invariably found to resist pasteur- 

 ization those most commonly detected were sporing bacilli of the types included 

 under the term B. mesentericus. Some streptothrixes appeared in some cases to 

 have survived, but the evidence on that point was not conclusive." 



Some living tubercle bacilli of bovine origin were found to have survived 

 treatment of drying milk over heated revolving cylinders, while the drying of 

 milk in a current of hot air had even less effect on tubercle bacilli. These 

 bacilli were capable of producing tuberculosis in guinea pigs, but the course of 

 the disease was much slower than that of the disease produced in guinea pigs 

 inoculated with the same amount of untreated tuberculous milk. 



Experiments relating to the creamery and dairy, A. Burr {Ber. Landw. 

 Reichsamie InneiTi, No. 35 (1914), pp- 227, figs. 7). — This reports experiments 

 on methods of testing milk and cream, and the operation of separators and 

 other creamery equipment. 



Report [of] marketing conference held in Chicago, October 29, 1914, at 

 [the] National Dairy Show (Chicago: Drovers Journal Press [1915], pp. 30, 

 pi. 1). — The papers given at this conference, which was held in connection with 

 the Ninth National Dairy Show, were Milk Marketing and City Distribution, by 

 C. F. Whiting (pp. 4-8) ; The Marketing of Butter, by L. D. H. Weld (pp. 

 8-18) ; Ice Cream Marketing, by M. Mortensen (pp. 19-24) ; and The Trans- 

 portation of Dairy Products, by E. M. Wentworth (pji. 24-30). 



VETERINARY MEDICINE. 



Farm animals in health and disease, A. Machens (Die landxcirtschaftlichen 

 HausUere in gesunclcn tmd kranken Tagen. RaUsbon: J. Habbel [lOl^h PP- 

 371, pis. 11, figs. 139). — A handbook of instruction on hygiene as related to the 

 horse, ox, pig, sheep, goat, and farmyard fowl, the recognition of disease 

 symptoms, first aid in sickness and accident, etc. 



Collected papers of the Lister Institute of Preventive Medicine {Lister 

 Inst. Prev. Med., Collected Papers, No. 10 (1913-14), pts. 1, pp. 68S, pis. 16. figs. 

 41; 2, pp. 650, pis. 13, figs. 44)- — ^Part one deals with bacteriological, epidemio- 

 logical, pathological, and statistical papers, and part two with biochemical, 

 physiological, and zoological papers. 



The biology of the blood cells with a glossary of hematological terms, 

 O. C. Gruner (Bristol, England: John Wright and Sons, Ltd., 1913. pp. J//+ 

 892, pis. 30, figs. 37). — This work deals with the subject under the headings of 

 the primordial blood cell, the red blood cell, the lymphocyte, the large mononu- 

 clear leucocyte, the neutrophile leucocyte, certain phlogocytes, and the cyto- 

 plastic phenomena of blood-forming tissues. References to the literature, a 

 glossary of hematological terms, a general index, and an index of diseases 

 of animals, and authors are included. 



