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Food Adulteration and Its Detection: With photomicrographic plates and a bibliographical appendixBattershall, Jesse P. (Jesse Park)

Science

Food Adulteration and Its Detection: With photomicrographic plates and a bibliographical appendix

Name: Food Adulteration and Its Detection: With photomicrographic plates and a bibliographical appendix
Author: Battershall, Jesse P. (Jesse Park)

Battershall, Jesse P. (Jesse Park)

Food adulteration and inspection; Food adulteration and inspection -- United States

---------+---------+------------+------------+-------------
  Range    |20 to 25 |25 to 30 per|30 to 35 per|35 to 40 per
           |per cent.|    cent.   |    cent.   |    cent.
  Number   |   21    |    151     |    499     |     179
  Per cent.|  2·47   |   17·76    |   58·70    |    21·05
  ---------+---------+------------+------------+-------------

The following tabulation exhibits the results obtained by the
examination of various grades of Formosa, Congou, Young Hyson,
Gunpowder, and Japan tea, made, under the supervision of the writer, by
Dr. J. F. Davis.

It will be noticed, if the same varieties of tea be compared, that,
with some exceptions, their commercial value is directly proportional
to the percentages of soluble ash, extract, tannin, and theine
contained.

  --------------+------------------------------------------------------
                |Formosa Oolong, Choice, 1st Crop.
                |     +------------------------------------------------
                |     | Formosa Oolong, Superior, 1st Crop.
                |     |     +------------------------------------------
                |     |     |Formosa Oolong, Choice, 3rd Crop.
                |     |     |     +------------------------------------
     Variety.   |     |     |     |Formosa Oolong, Superior, 3rd Crop.
                |     |     |     |     +------------------------------
                |     |     |     |     |Congou, Choicest.
                |     |     |     |     |        +---------------------
                |     |     |     |     |        |Congou, Medium.
                |     |     |     |     |        |     +---------------
                |     |     |     |     |        |     |Congou, Common.
  --------------+-----+-----+-----+-----+--------+-----+---------------
                | c.  | c.  | c.  | c.  |   c.   | c.  | c.
  Price per lb. | 70  | 28  | 55  | 24  |65 to 70| 24  | 14
    (wholesale).|     |     |     |     |        |     |
                |p.c. |p.c. |p.c. |p.c. |  p.c.  |p.c. |p.c.
  Total ash     | 6·50| 5·96| 5·80| 6·34|  6·22  | 6·36| 6·58
  Ash soluble in| 3·60| 2·86| 3·12| 3·60|  3·56  | 3·00| 2·88
    water.      |     |     |     |     |        |     |
  Ash insoluble | 2·90| 3·10| 2·68| 2·74|  2·66  | 3·36| 3·70
    in water.   |     |     |     |     |        |     |
  Ash insoluble | 0·86| 0·94| 0·56| 0·66|  0·56  | 0·66| 1·06
    in acids.   |     |     |     |     |        |     |
  Extract       |42·00|37·40|43·20|40·60| 34·60  |29·60|26·20
  Insoluble leaf|54·90|59·55|52·70|56·55| 60·75  |64·80|68·75
  Tannin        |18·66|16·31|18·00|16·05| 14·87  |13·70|12·26
  Theine        | 3·46| 2·20| 2·26| 1·39|  3·29  | 2·23| 2·35
  --------------+-----+-----+-----+-----+--------+-----+-----

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Food Adulteration and Its Detection: With photomicrographic plates and a bibliographical appendix

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