On conditions necessary to obtain a clean milk supply and on methods of testing cows' milk in relation to standards of cleanness : report to the Sub-committee on clean milk / by S. Delépine, June 16th, 1918.

Auguste Sheridan Delépine

Date:: 1918

Credit: On conditions necessary to obtain a clean milk supply and on methods of testing cows' milk in relation to standards of cleanness : report to the Sub-committee on clean milk / by S. Delépine, June 16th, 1918. Source: Wellcome Collection.

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$Chapel Experiments— Cunlinual. Treatment of Milk, before Sample taken Time Sample taken after Milking Keep Sample Exam] Time mg of before mation Temp. No. of Bact Glrowing at 20° C. on gelatine eria per 1 cc. Growing at 37° C. on agar. Additional Tests In 72 hours. In 24 hours None... 10 min. 21 hrs. Under Under See effects of in- 15° 100 100 cuhation at 27° 0. Table XII. Examination of air in clean and dirty shippons. N one.. J? 33 400 500 and “rinsing” of dairy pail, Table XIV. Strained through the dairy 15 min. 112,000 2,000 strainer (used previously to strain 23 lbs. of morning milk) into the dairy pail (also used in the morning) As above, and passed over j* 10,600 200 the dairy cooler, which h\d been rinsed the previous night, and not used since Poured into model sterilized 15 min. „ 2^ hrs. 10-12° 1,300 30 churn, without general straining Passed over dairy cooler 20 min. >5 25,900 400 i (clean but not sterilized) (Milk 20° C.) Passed through clean dairy •« 35 53 23,000 300 strainer and cooler, and received in sterilized pail Strained through clean dairy 15 min. 5 5 53 44,200 6,350 Samples 8946ab, strainer into clean dairv taken at the pail Laboratory after journey between farm Poured into model sterilized 21 hours 21 hrs. 55 3,700 30 and Laboratory churn, without general ( in model churn straining, and kept in and dairy cans model churn in transit respectively. Effects of keep- Strained through clean dsiry 21 hours 5 5 55 55,000 2,720 ing and of in- strainer into clean dairy Milk 17° G.) cubatioii, , pail, and kept in dairy can ^ Table XIII. in transit 1 -$