86 Report oF DEPARTMENT OF BACTERIOLOGY OF THE 
TABLE VIII.— Germ ConTENT oF MitK FromM Two DIFFERENT TYPES OF 
B-L-—K MacuiInes UNDER SIMILAR CONDITIONS OF OPERATION. 














Old Machine No. 1288. New Machine No. 2716. 
1907. Nora Bess. Millie Mabel Nora. Bess. Millie Mabel 
F. G. F. (Ge 
Germs per cc. of milk. Germs per cc. of milk. 
Fe Maa ae eee te 14,300 Git UT 5 ais oe PU Ronee Gunes © x, call. Some eens 5,810 '| 2,840 
: PRO clay Oe ER ee BBR teas | 8,390 |20,060 2,310} 22701) 2.0 eee 
*) OY hehe Palen ts FD SLO: eigen Ol tetee nates ott Gkerk ceei einen: cc te taal ee ee *650 |*4,710 
ALLE s tral ama) eRe eae Weg ce 14;0409/21; 920 :||' 2,230 1,880.40. o.55 ae 
a Leb ben cae 2,760 Le 7 SO vile is cine wllcseee Ontos LIN ee teenie get eee 1,210 | 6,050 
% UR AS LAS MBC RE | feeewt hate ste T5210 167650 1'5650))] 3542001 ~ 7S eds 
ig al NaF SES came as rae we Wn pee ed 11,040 |10,130 1,410 3) L720 0. ee ee eee 
Fe) LYE teens *4,810 |*10,750 aegare (2) Cie Paes k Ae packs *3 ,040° |*7,510 
SUE ie, PUT Bae aed PORE MiG 9 8,800 | 5,170.1 1,080) 2, 700 4. ec eet eee 
AE TORN RLM: aie. 1,460 87200 TH. Pee EC Oe aN Tee 9,370 | 5,400 
oy A 7. Dept RE PeA 0 MRORRRED ke Ui), ae 1,130 |16,140 990° | 1,990.4 Seca tate ee 
MTERD Lite doenraae 2,750 4. GBOFl 12), 168 ee eA ee ee a es eee 7,100 720 
Average... ...1... 4,898 | 5,780 | 7,600 [14,995 || 1,610 | 2,160 | 4,530 | 4,540 
General average. . 8,340 ‘oe 37240 





* Teat cups changed before milking. 
The results bring out quite clearly the fact that the new 
type of milker is a distinct improvement over the one which 
preceded it. Not only is the average germ content with ma- 
chine No. 2716 distinctly lower than that of machine No. 1288, 
but what is even more important, the results with its use are 
subject to far less variation than with the latter one. Of these 
28 consecutive determinations with machine No. 2716 not one 
of them showed 10,000 per cc. and the average of all is less 
than one-third of that number. It should be noted, however, 
that these results were obtained in December and it does not 
follow that as low counts could be obtained with a like 
regularity in summer. 
The practical improvement in the new type of machine was 
actually greater than was shown by these figures. The filter 
cups on machine No. 1288 were so small that the proper filling 
of them was attended with difficulties. After the tubes had 
