332 EXPERIMENT STATION RECORD. 



Effect of light on the animal body, II. Qui.nxke {Pfiigers Arch. Physiol., 57, No. 

 o and 4, pp. l.'.l-US). 



An apparatus for measuring the respiratory gas exchange of human beings 

 on the principle of Regnault, F. Hoi-pe-Seyleu (Ztachr. phijsiol. Chem., 19, No. G, 



pp. ,'.: i-.'/.sf)). 



RespiraUou experiments on healthy persons, E. Laves {Zlschr. lyhysioL Chan., 



19, No. l,,pp.0'Jl-CO^). 



Principles of breeding, L. Di'mas {Bui. Min. A(jr. Bclgiqiu, 10 {1SD4), No. 1, pp. 

 '^1-70).— \ discussion of the heredity of form, habits, intelligencfc, health, etc., m 

 breeding domestic animals. 



Slaughter experiments and investigations regarding the quality of flesh of 

 animals at the Fat Stock Show in Berlin in 1894, C. Lehmann {Dent. landw. 

 I'resse, 21 {ISM), No. ■}'>, pp. 7 Hi, 717; No. 76, pp. 721, 722, figs. 8). 



Feeding calves {MoJk. Ztg., S {1894), No. 35, pp. 530,531).— Ymctic-Al directions 

 deduced from the result of scientific work. 



Feeding experiments vwith pigs, J. B. Lindsey {Massachusetts State Sta. Ept. 

 1893, pp. 90-124).— This is a detailed account of the eighteenth and nineteenth pig- 

 feeding experiments at the station, a brief account of which was given in Bulletin 47 

 of the station (E. S. R.,5, p. 74). 



VETERINARY SCIENCE. 



The use of Koch's lymph in the diagnosis of tuberculosis of 

 cattle, J. Nelson {New Jersey Sta. Bui. 101, pp. 79, charts .'>).— An 

 accouut of tlic work of ridding the college farm herd of tuberculous 

 cattle, a general discussion of tuberculosis, a record of temperatures of 

 animals injected and of the results of autopsies, and a technical discus- 

 sion of the results secured. 



Forty-one animals were injected with tuberculin; 24 showed reac- 

 tions, and in all these cases except 2, which were doubtful, tuberculous 

 lesions were found on post-mortem examination. 



Following is the author's summary: 



"(1) A 'reaction' consists in the recognition by the body of the presence of 

 toxins to which the previous presence of tubercle bacilli has rendered the tissues 

 sensitive. It is incapable of exact measurement and can best be determined from a 

 calculated normal, the location of which can be approximately fixed from an 

 extended series of temperature observations on the individual whose record is iir 

 doubt. It can also be located as being certainly below a lixed maximum deter- 

 rnmed for the herd, and, iiually, the initial temperature gives a clue to it, because 

 the latitude of individual variation is only half that of the herd as a whole, viz, 

 about 2.2- . Furthermore, the associations of normal temperatures with the initial 

 evening record is such that a yet closer approximation may bo made. 



"(2) Thus, the* determination of the reaction reduces itself to a revision of the 

 ordinary mcth(.d (that, viz, by taking the diflerence between the initial temperature 

 and the maximum record) by incorporating the principle that the tem])erature of 

 an animal tends to vibrate about a fixed mean, with fixed maximal limits of oscilla- 

 tion, bcycmd Avhich any excess must be certainly predicated as a reaction. Further- 

 more, that this reaction is an extended aflair, the true total reaction being the inte- 

 gral of tlie reaction curve. 



" (3) The duration of a reaction is proportional to the greatest height thereof. 



" (4) The higher the reaction the sooner it occurs. 



"(5) The height of rt?actiou is no index to tUe amount of tuberculosis present, 



