vons mesure cette acidite
dans une culture sur petit lait de vingt-quatre heures;
elle etait .261 grms. per cent. exprimee en acide
lactique," which will make the amount of lactic acid
produced in one litre of milk 2.61 grms. The production of
this small amount of lactic acid does not tally with the
ordinary view of the vigorous lactic-acid-producing power
of the bacillus.

[35] _Prolongation of Life._

[36] _Prolongation of Life._

[37] An accurate census of Bulgaria is being prepared and
will exhibit the cases of long life in that country.

[38] See A. Rosam, _Oesterreichische Molkerei Zeitung_, 15,
p. 31.

[39] _Revue generale du Lait_, vii., pp. 8 and 9 (letter
from Dr. Otakar Laxa of Prague, Bohemia, to the author).

[40] _On the Prolongation of Human Life_, by Elie
Metchnikoff; also _The Century Magazine_, Nov., 1909, "The
Utility of Lactic Microbes," by the same author.

[41] _Century Magazine_, Nov., 1909.

[42] See _Annals of Dairying in Europe_, by Loudon M.
Douglas.

[43] Adapted from a report by Robert E. Turnbull, in _Live
Stock Journal_.

[44] _Facts about Milk_, by R. A. Pearson, B.S.,
Washington.

[45] _Care and Handling of Milk_, Marshall and Wright,
Bulletin 221, Michigan, 1904.

[46] _Journal of the Royal Society of Arts_, March 6,
1908--"Modern Dairy Practice," by Loudon M. Douglas.

[47] Skolotowski, _Wratsch_, 1883 (Russian), from
Codwyssozki.

[48] Podowyssozki, _Zeitschr. f. diat. u. physik.
Therapie_ vol. v., 1901, p. 570.

[49] Hammersten, _Jahresb. u. d. Fortsch. d. Tierchem_,
1886, Bd. 16, p. 163.

[50] Essaulow, _Dissert. Moscow_, 1895, _Abstr., Koch's
Jahresb._, 1895, Bd. 6, p. 222.

[51] Kern, _Bulletin Soc. des Naturalistes de Moscow_,
1881, 3, p. 141.

[52] Krannhals, _Deutsch. Arch. f. Klin. Med._, 1884, Bd.
35, p. 18.

[53] Beijerinck, _Centralbl. Bakt. Par._, 1889, Bd. 6, p.
44.

[54] Scholl, _Die Milch_, Wiesbaden, 1891, p. 38.

[55] Adametz, _Centralbl. Bakt. Par._, 1889, Bd. 5, p.
116.

[56] Freudenreich, _Landw. Jahrb. d. Schweiz._, 1896, vol.
x., p. 1.

[57] Nikolaiewa, _Annals of the Botan. Lab. of the Med.
Inst. for Women_, No. 10. St. Petersburg, 1907.

[58] Kuntze, _Centralbl. Bakt. Par._, 1909, 24, p. 101.

[59] See Chap. II.

[60] Rubinsky, _Centralbl. Bakt. Par. II._, 1910, vol.
xxviii., p. 161.

[61] Biel, _Jahresb. ue.