94 REPoRT OF DEPARTMENT OF BACTERIOLOGY OF THE 
EFFECT OF DISCONNECTING RUBBER PARTS AFTER REMOVING 
THEM FROM THE SALT SOLUTION. 
TABI Ori? 





















Tubes not separated. Tubes separated. 
Machine Machine Machine Machine 
No. 2437. No. 2716. No. 2437. No. 2716. 
1907. we 1908. a 
Seas Ruth. | Nora. | Bess. aaa Ruth.| Nora.| Bess. 
Germs per ce. in milk. Germs per cc. in milk. 
Dec. 30....| 1,350/16, 750} 5,750) 3,500} Jan.) 2.....1/11,100) 5,060) 6,280) 39760 
A he MES Wale 2,100) 4,870) 4,250) 2,390); “* YG aes 240} 8,340|)14,420)10,870 
SOR YO irae rae 3,040} 1,060) 1,620)13,300)| “ 9.....) 2,140! 3,940 840| 2,460 
9 heli ty aye 4,500] 4,430) 1,480} 5,710)| “ gM sty 5,190/12,770 620| 2,560 
Pa Ayres & 990} 2,490) 1,120) 2,340]; “ Lows te 1,790} 7,960) 1,500/39, 950 
A VOIR GG. s ei eer sie ee sem ne bre oF city Us vey we 1,370] 3,410] 5,350) 1,630 
Average....| 2,390] 5,900] 2,890] 5,450 3,640] 6,910} 4,870]10,210 
Gens aVelur. 4,150 6,410 

These results show that while the average effect of this op- 
eration is only a slight increase of the germ content, this 
increase is produced by a marked rise on a few occasions. Ap- 
parently it is only occasionally that in the process of changing 
the teat cups foreign matter finds its way into milking tubes 
and thence-into the milk. This is fortunate, since in milking 
a large dairy it is practically impossible t¢ avoid an occasional 
change of teat cups. 
CONCLUSIONS 
The point which is emphasized.by these studies is that the 
quality of milk obtained from a milking machine depends 
primarily upon the intelligent care which is exercised in the 
manipulation of the machine. : 
The most important item in this connection is the careful 
immersion of the milking parts in a brine or similar solution 
between milkings. This has been shown to be many times more 
efficacious than the most careful steaming. While there is 
