70 ~~. Report of DEPARTMENT OF BACTERIOLOGY OF THE 
fifteen times as great as that of milk drawn by hand under 
comparable barn conditions. 
Since the bacteria are directly responsible for the ordinary 
changes in milk and their numbers can be determined with a 
fair degree of ease and accuracy, we have used the numbers 
present as a convenient measure of the quality of the milk. 
While not perfect, this is at present the most satisfactory avail- 
able measure, with fresh milk, of the sanitary conditions which 
have surrounded its production. 
Our results with the Globe milking machine give the germ 
content of the milk where the machine was carefully washed 
each day but the rubber parts were not kept in brine. In this 
test four cows were selected and at each milking two were 
milked by hand and two with the machine. Each pair of cows 
was milked alternately by hand and by the machine so that the 
conditions of hand and machine milking were made as nearly 
alike as possible. Composite samples representing the milk 
of two cows were examined in each case. A representative por- 
tion of these results is shown in Table I. 
TABLE I.— COMPARATIVE GERM CONTENT OF MILK DRAWN BY GLOBE 
MACHINE AND By HAND. 





Germs per cc. Germs per cc. 
in milk: * in mee 
1906. Cow. Machine drawn. 1906. Hand drawn. 
A. M. P. M. A. M. P. M. 
Aug 20 sh ep eel 1&2 680 , 000 349,750 Aug. 24... 9 520. hae eee 
ES Vepoie See BTA 3 & 4 625, 500 762,000 Se we cae 1571507) See ee 
eprole ae. Ufc 24 835 ,000 770,500 SAM ZO An are ta DOU 5,800 
ce A a a ea 3 & 4 718,500 452,500 spi vie: 58 , 000 16,100 
(op Oo ORerE felt 1S 962 ,000 675,500 iO Giee 11,050 10,870 
Py hint Ree 3&4 593 ,500 |1,700,500 es” pele of 17/7350 20 ,330 
CeQ8 ue ae 1a? 864 ,000 639 , 600 fe AST 74,000 2,250 
hE ENS ve E 3&4 585,000 |1,113,500 Bid aby. 43 ,000 6,400 
OE rT dot ti whe Der Oui tte be Ree 748,500 C20 Aa ee a ae 6,650 
Sf Sep RE le 3 Ot 4 hie, Gaeeaee 798,500 66 A, ae St ce ees 3,620 
Se Oe Chek 3 Dee 2 SID AHOOMP Meee nereeed PPO Re 8,500 5,600 
iy DLE SM 3&4 yar LONGO | Ves eat” ee ie tae 13 ,120 5,550 
AVCTALS a bin/sh ncieee eae a 653 , 300 731,785 Average. . 24,969 | 8,317 
Geniave hse se ERR ak 692,542 Gen. av.. 16 , 643 
*Not in average. 
