MILKING MACHINES j11 
in itself very good and would make a good showing for the 
machines were it not for the fact that the numbers in the 
hand drawn milk are so much smaller. In every case, how- 
ever, the comparison is in favor of the hand drawn milk and 


TABLE 26, 
Comparison of hand and machine drawn milk. Machines 
washed at night by pumping warm water through them, 
then allowing to stand until morning; after morning milking 
thoroughly washed with brush and hot water with washing 
powder; tubes hung up in air; pails sterilized in steam. ~ 













c : 3 bo a 3 oe a aa 
of Method of o's 85 = ae o Boo 
Date E Gop * Milking’ |, 5 : 83 23 | g23 | a3 
mats OQ pO ila yh 
1905 Machine | P.M. 4,900 a 80 290 
Nov. 15 | 239 Hand P.M. 1,900 a 100 260 
Nov. 16 | 241 | Machine | a.m. | 16,640 a 150 1,19C 
Hand A. M. 6,730 a Pistia eaplane (the 
Nov. 16 | 254 | Machine | P.M. 1,660 400 0 70 
Hand P.M. 200 10 0 10 
Nov. 17 | 256 |. Machine |.a.m. | 14,580 | 5,470 40 | 1,030 
Hand A.M. 1,880 4300.4. 100 310 
Nov. 17 | 260 | Machine | Pp. Mm. 2 TOU looU 0 180 
Hand P.M. 710 175, 0 150 
NGOVelori262-)> Machine } a.m. | 35;300°| 1,120 5OV ia Learn 
Hand A.M. SiO 0 0 390 
Nov. 19 | 265 | Machine | p.m. | 15,430 a 0 360 
Hand P.M. 2,640 a 0 180 
INGvi.20) 1)267..\):Machine | :A: Mm. |231;300°)-° a QO |} 1,140 
Hand KIM oVs 3430 a 40 260° 
Nov. 20 | 269 | Machine | P.M. S LLow A rO 20 390 
Hand P.M. 1,290 380 0 16 
Nov. 21 | 271 | Machine | a.m. | 24,000 | 3,100 40 | 1,640 
Hand . A.M. 8,890 520 150 | 1,580 
Averages Machine 15,524 | 2,149 38 806 
: Hand 3144 154252 41 538 



a=Acid bacteria not determined. 


in most cases the difference is very great. As might be ex- 
pected under such treatment, the machines were not sterile, 
and it was found that the rubber tubes contained large num- 
bers of bacteria which were not washed out by the method 
used. It was found under these conditions that the number 
of bacteria was normally very much higher in the machine 
drawn milk than in that drawn by hand. The method of 
washing the machines was therefore changed. 3 
