METHOD OF DRA WING STERILE MILK 



43 



and at the other with a length of about 5 inches of glass tubing 

 drawn slightly to a point in order to allow it more readily to enter 

 the tube orifice of the flask in sub- 

 sequent manipulations. A Mohr 

 pinchcock is placed on the india- 

 rubber tubing midway between the 

 two terminal tubes, and these latter 

 are placed in test tubes plugged 

 with cotton-wool, and in which a 

 few drops of water have been placed 

 in order to ensure perfect sterilisa- 

 tion. The whole apparatus, includ- 

 ing the flask, is then sterilised in 

 the autoclave and held in reserve. 



MetJiod of drawing tJie milk. — 

 Select a healthy cow in full milk, 

 and which a careful inspection 

 shows to be free from any signs of 

 indurated udder. Place in a stall 

 or box from which all litter has 

 previously been cleared away, and 

 the floor of which has been well 



washed down with water. Wash carefully the flanks, belly, end of 

 tail, udder, and teats, with clean water followed by bichloride solu- 

 tion, or other effective germicide. Let the attendant, after rinsing 

 his hands well with the antiseptic solution, draw about a dozen 

 draughts of milk on to the ground in order thoroughly to clear the 

 milk duct of any organisms which may have worked their way 

 up it. After this is done, take from an assistant the test tube 

 containing the milking tube, remove this latter from the tube, and, 

 holding the teat in the left hand, pass the milking tube into the orifice 

 of the teat and up until the constrictor valve is felt to be passed. The 

 milk will at once begin to flow into the india-rubber tubing. Open 

 the pinchcock and the milk will flow freely into the test tube con- 

 taining the glass outlet tube. It is better to let this fill almost to 

 overflowing in order that any stray organisms which may possibly 

 have got on to the milking tube in the previous manipulations may 

 be washed away. Compress the tube with the pinchcock, remove 

 the paper covering from the vacuum tubing, and taking the glass 

 tube out of the test tube, pass it quickly into the open end of 

 the tubing. The milk will then flow freely into the flask on opening 



Fig. 3. — Milking tube and accessories. 



