1338 Wisconsin Academy of Sciences, Arts, and Letters. 
The milks pasteurized in the bottle are very much, better than 
those pasteurized in bulk. The count is low, especially in M 2 , 
since A 3 and A 4 were taken from the plant and usually soon 
after pasteurization, while M« was delivered in the early morning 
and remained on a doorstep for some hours before it was taken 
to the laboratory. B. coli was practically never found in 1 c. c. 
lots. The number of Bact. Welchii is low as well as the number 
of resistant aerobic forms. 
3. Inspected Milks. The inspected milks (Table II.) are most 
of them of only a fair grade. Certain ones, however, are uni¬ 
formly excellent, such as B 3 and G. The latter belongs practi¬ 
cally in the certified class. B. coli is usually present in 1 cc. 
amounts, except in the very best of them. Bact. Welchii is fre¬ 
quently present and occasionally in large numbers. The best of 
these milks have a very small number of resistant forms or 
spores, but the poorer grades frequently have large numbers. 
4. Certified Milks. The certified milks (Table I.) have usu¬ 
ally been found to be excellent. 
E. Discussion of the Various Factors Studied and Their Sig¬ 
nificance. 
1. Total Number of Bacteria. (Table V.) 
a) Law Milks —Grade D. 
The raw milks studied belong to two different classes,— those 
that are to be sold raw, and those that are to be pasteurized in 
bulk before being put on the market. The milks of the latter class 
are A^Bi and C x . It will be seen from Table V.that of these, even 
in midwinter, very few samples came within the prescribed lim¬ 
it. The average of six samples of A 3 was 1,741,400, of seven 
samples for B 1 was 1,786,000, of eight samples for C x was 
2,211,600, which is from 70% to 100% above the standard of 
1,000,000 set by the Commission. 
The other class, namely, those to be sold in a raw condition, are 
represented by E, K, and L, which give the following averages 
respectively: 180,000, 6,916,500 and 3,970,000 bacteria per c. c. 
Milks F ly F 2 . F s , and F. 4 are from a small town of about 
15,000 inhabitants, some sixty miles from Boston. So far as 
can be judged by the total number of bacteria, it is seen that these 
milks are considerably better than those of a large city. One 
