2 THE ANALYST. A POINT CONCERNING MILK CONTROL. BY DR. P. VIETH, F.C.S. Bead bsfore the Society oj* Public Analysts orb 15th Aorernbcr, 1882. I& the early part of this year I made an investigation with the view to ascertain whether there is in the milk delivery churns a yise of cream to a oonsiderable extent during the time ~- ~ -_-- - * We are compelled to hold over these papers until our next nwnber.-EP. Analyst.THE ANALYST. 8 ~~ in which the milk is delivered to the castomere. I selected for my experiment a round which goes rather far, to Chiswick, bad the milk in the churn thoroughly mixed, and a sample drawn from tbe tap of the churn just before the man left the yard of the Aylesbury Dairy Company’s premises, St. Petersburgh Plaee, Bayswater, at one o’clock, One of the company’s inspectors had orders to take two more samples about at the beginning and towards the end of the delivery.These eamples were taken at 2.45 and 6.20 in the after- noon. The three samplesl were analyeed, with the following result :- Spec. grav. Tot. solids. Fat. SO~. n. fat. 1. Sample taken before milk was sent out ........ 1.0335 1305°/0 3’300f0 9*750/0 2. . . . . on the round at 2.45 o’clock.. .... 1.0336 13.13 .. 3.40 .. 9.73 .. 3. . . . . . . . . . . . 5.20 ........ 1‘0330 18-24 .. 3.50 .. 9-14 .. These figures prove that there had not been any considerable alteration in the milk, and this result quite agrees with those I find every day with the regular smples taken by our inspeotors from the men when working their rounds. I t is only a very short time ago since I met with a milk which behaved very differently.There is a sample taken from each round before it leave8 the yard. On the 28th of October one of these samples showed the unusually high specifm gravity of l*OS45. The mmple was analysed, as was likewise a sample of the milk brought back from the round. The reslnltsl were as follows :- Bpeo. gmv. Tot. solide. Fat. 801. n. fat. 1. Sample taken before sent out ................ 1-0345 12.18°/,, 2°600/, 9.68°/0 2. . . . . as returned ................ 1.0335 13132 .. 3*70 .. 9-62 .. The day after the next, October 8Oth, a sample of milk from the Hame farmer was taken immediately after the milk had arrived in the dairy, and had been thoroughly mixed; that took place at 12 o’clock. Tho milk wag then turned over from the railway churn into the dolivery ohurn, and a ijeoond sample drawn from the tap of the latter, before it went out, at one o’clook.A third sample was taken of the milk returned at five o’clook. 1. Srtmple taken at 12 o’clock.. ................ 1.0330 13*86O/, 420°/o 9*66O/, 2. . . . . . . 1 .................... 100345 12-70 .. 3.00 .. 9-70 .. The results of analysing these three samples were as follows :- Speo. grav. Tot. erolidrs. Fat. SO~. n. iat. 3. . . . . . . 5 .................... 1.0330 1366 .. 4-10 .. 9.56 .. On the 31at of October a sample was again taken of the milk,. when delivered into the dairy, and properly mixed. One hour later two other samples were taken, one from the top and one from the bottom of the churn-the latter drawn from the tap. The composition of these three samples is given in the following figures :- Speo. grav.Tot. eolids, Fat. Sol. n. fat. 1. Sample taken at 12 o’clock ................ 1*0130 13’36O/, 3-90°/, 9.46% 2. ,, ,, ,, 1 ,, from the top 1.0246 20-96 ,, 1150 ,, 946 ,, 34 $9 9 9 9 , 9 9 I ) ,, ,, bottom 1.0340 19.40 ,, 2-90 ,) 9.50 ,, Finally, ori the 1st of November, I had samples taken its follows :-The first sample sb one o’clock, before the milk left the yard, three samples on the round, at two, three, and four o’clock, and a fifth sample of the milk returned at five o’clock. The analytical exami- nation of these five sayderrygave the followiga resnlts :- Spec, grav, Tot. solids. Fat. 801. n. fat. 1. Sample taken at 1 o’clock .................. 1.0325 13*30°/, 3‘90”/, 9*40°/ . . . . . . .................... .. .. 2. 2 1.0345 12OL,, 2.60 9.54 3. . . . . . . 3 .................... 1.0360 11.86 .. 2.30 .. 9-56 . 4. . . . . . . 4 .................... 1.0306 15.80 .. 640 .. 9-4 .. .. .. Q. ,, .... 5 ,, .................. 1-0290 1632 6.90 94%4 THE ANALYST. From this day the milk concerned was not sent out any more. The milk referred to was brought to London by rail from a dist.ance of about seventy-two miles. It had always s quite normal appearance and reaction. Set aside in a cremometer, an extensive and dis- tinot layer of Cream ia thrown up in the short time of half an hour. On microaeopical examination, the fat globules were found to be of larger size than usual. I think it rather am uncommon occurrence that milk throws up the cream 80 quickly, as shown in the preceding case; but as sueh cases may happen, it will be good to keep this point in mind when judging milk samples taken in the street,