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96
Nos. 1, 3 and 5—Ice Cream—September, 1925.
Dilutions of 1/100 and 1/1000 were plated on agar in
quantities of .lcc and .25cc. Dilutions from lcc to
•0000lcc into McConkey Bile Salts.
Nos. 2, 4 and 6—Ice Cream Scrapings and Deposits—lst
September, 1925.
Inoculated .lcc into McConkey Bile Salts.
No. 1. Ice Cream.
Average No. of colonies = 3,613,900 per cc.
Bile Salts lcc
•lcc)
•Olcc ) All gave acid and gas.
•001 cc)
•OOOlcc)
•0000 lcc)
Direct films—Staphylococci, gram negative bacilli and
yeasts.
Total count—3,613,000 per lcc.
Acid and gas appeared in all dilutions.
Flaginæ
reactions negative for B. Coli.
No. 2. Ice Cream Scrapings.
Appearance—greenish colour.
Direct films—Staphylococci, streptococci, gram negative
bacilli and yeasts present.
Plates—Strong growth of staphylococci.
No change in McConkey Bile Salts.
No. 3. Ice Cream.
Average No. of colonies—2,888,700 per cc.
Bile salts lcc
•lcc)
•Olcc)
•00 lcc)All gave acid and gas.
•OOOlcc)
•OOOOlcc)