6 
BULLETIN 361, U. S. DEPARTMENT OE AGRICULTURE. 
Table 6. — Comparison of bacterial count with Lorenz sediment test {milk filtered through 
1-ply absorbent cotton and cheesecloth). 
Sample No. 
S^SiS. Character 
SmeYer. of sediment. : 
Sample No. 
Bacteria 
per cubic 
centimeter. 
Character 
of sediment. 
1. 760,000 Oood. 
6 
57,000 
362,000 
471,000 
48,000 
191,000 
Good. 
2. 67,000 
Do. 
Do. 
Do. 
Do. 
Do. 
3 31,400 
4. 1 42.000 
S 
9 
Do. 
Do. 
5 
61, 300 
10 
Do. 
In every instance in which the milk was filtered through any sub- 
stances to remove visible dirt the disks were classed as good. 
It would seem from the results shown in the last three tables that 
if milk is strained before applying the sediment test the latter is of 
little, if any, value in estimating visible dirt. 
CONCLUSIONS. 
1. The writer considers the Lorenz apparatus the most convenient 
and practical for demonstrating dirt in milk. 
2. The quantity of sediment or visible dirt present on the disk is no 
criterion as to the kind or number of bacteria contained in the milk. 
3. The various sediment tests are applicable only in roughly esti- 
mating the quantity of sediment in unstrained milk, and can not be 
used solely as a means of determining the hygenic conditions under 
which it was produced. 
4. If milk is strained through the substances mentioned, the sedi- 
ment testers are of little value in estimating the degree of contami- 
nation. 
REFERENCES TO LITERATURE. 
New and Improved Tests of Dairy Products. S. M. Babcockand E.H. Farrington, 
Wisconsin Station Bulletin No. 195, pp. 3-13. 
The Milk Sediment Test and Its Application. A. 0. Baer, Wisconsin Agricultural 
Experiment Station, Circular of Information No. 41. 
Experiment with FliegePs Apparatus for Determining Dirt in Milk. J. Klein, 
Milehw. Centbl. 1. (1905), No. 7, pp. 305-307. 
Comparison of Bacteria in Strained and Unstrained Samples of Milk. H. W. Conn 
and W. A. Stocking, Storrs Agricultural Experiment Station Bulletin, 1903-1905. 
