No. 4.] CATTLE COMMISSIONERS' REPORT. 531 



In considering this part of the report, one is at once struck 

 with the hesitancy with which the commission recommend the 

 use of milk from tuberculous cattle, even although the animals 

 do not show apparent udder lesions ; and the question for us 

 at once arises, as to whether or not it is practicable, in dealing 

 with this matter on so large a scale, to draw any line whatever 

 as to the location of the disease ; that is to say, even with this 

 testimony in view, is it not tar better and safer to at once 

 destroy the cow, when it has become clear beyond doubt that 

 she is the victim of tuberculosis? 



As to the influence of the cooking process upon tubercular 

 milk we have the following, from the report of the Royal 

 Commission : — 



Sterilization towards tubercle can be effected by heating the milk 

 in a water bath, continuing the process until the temperature has 

 risen from 176° F. to 198° F., — a result which in most cases re- 

 quires each several quart of milk to be in the water bath for some 

 half hour. 



Dr. "Wood head has not wholly demonstrated to our satisfaction 

 the innocence of tuberculous milk treated in this manner; he tells 

 us of pigs succumbing to tuberculosis after feeding with tuberculous 

 milk heated to 176° F. for ten minutes, without giving adequate data 

 about the action or inaction of the milk after longer exposure to this 

 temperature ; and his experience of the higher temperature is derived 

 from guinea-pigs only, not from 'pigs ; though, as he has shown, 

 guinea-pigs do not supply such good evidence as pigs about the 

 influence of heat upon tuberculous matter in use as food. 



In speaking further of these experiments made by Dr. Wood- 

 head, the Royal Commission say : — 



Nor, if we regarded the described method as certain in its efficiency, 

 should we hesitate to refer to any such "sterilization" the simple 

 expedient of putting every suspected milk over the fire and taking it 

 off when it boils. 



A very interesting statement of this report is as fol- 

 lows : — 



In the course of Dr. "Woodhead's observations on the degrees of 

 heat wanted to destroy the operation of tuberculous matter in milk, 



