Chapter XXII: Part 22

_Valuation._--For the valuation of malt the following determinations
are usually carried out: Extract per standard quarter, moisture,
diastatic activity by the Lintner process, tint, and matters soluble
in cold water. The physical examination of malt is also a matter of
importance, inasmuch as direct evidence is obtained thereby of the
modification of the malt. Among the methods adopted for this purpose
may be mentioned counting the percentage of corns in which the
acrospire has grown up to one-half, two-thirds and three-fourths the
entire length of the corn. In properly made malt the modification of
the endosperm should proceed _pari passu_ with the growth of the
acrospire. The sinker test is also useful when carried out in an
intelligent manner. Those corns which sink in water and lie flat are
improperly modified. Normal malt has a specific gravity less than
water and the corns have equal density throughout; consequently they
float horizontally in water. In forced samples the proximal ends are
frequently lighter than the distal ends, and the corns float
horizontally in water, with the germ directed upwards. The latter,
however, may in some cases fill with water, and the corns lie flat or
sink. This is a characteristic of over-modified malt. It will be seen
from these remarks that it is essential to carry out the sinker test
under standard conditions. The modification of the malt may also be
determined by means of the diaphanoscope already referred to under
Barley.

BIBLIOGRAPHY.--M. M. W. Baird, _Journ. Inst. Brewing_ (1905), 11, 431;
J. L. Baker, _Journ. Chem. Soc. Trans._ (1902), 81, 1177; _The Brewing
Industry_; J. L. Baker and W. D. Dick, _Journ. Inst. Brewing_ (1905),
11, 380; J. Baverstock, _Treatise on Brewing and Malting_ (1824); E.
S. Beaven, _Journ. Fed. Inst. Brewing_ (1902), 8, 542; R. H. Biffen,
_Journ. Inst. Brewing_ (1906), 12, 366; Board of Agriculture and
Fisheries (Leaflet 149); A. J. Brown, _Annals of Botany_ (1907), 21,
79; H. T. Brown and G. H. Morris, _Journ. Chem. Soc. Trans._ (1890),
57, 458; H. T. Brown and others, _Trans. Guinness Research Lab._
(1903), vol.--pt. I. (1906), pt. II.; M. Delbrück, _Journ. Inst.
Brewing_ (1906), 12, 642; Ford, _A Treatise on Malting_ (1849); C.
Graham, Cantor Lectures, Society of Arts (1874); J. Grüss,
_Wochenschrift für Brauerei_ (1895), 12, 1257; (1896), 13, 729;
(1897), 14, 321, 409; (1898), 15, 81, 269; (1899), 16, 519, 621; (1902), 19,
243; W. Johannsen, _Résumé. Comptes rendus trav. lab. Carlsberg_
(1884), 2, 60; A. R. Ling, _Brewers' Journal_ (1904), 40, 741; E. J.
Mills and J. B. Pettigrew, _Journ. Chem. Soc. Trans._ (1882), 41, 38;
E. R. Moritz, _Journ. Fed. Inst. Brewing_ (1895), 1, 228; E. R. Moritz
and G. H. Morris, _A Textbook of the Science of Brewing_ (1891); J. M.
H. Munro and E. S. Beaven, _Journ. Roy. Agric. Soc._ (1900), 11, pt.
II., 5; T. B. Osborne, _Report_ of Connecticut Agricultural Experiment
Station (1894); H. Stopes, _Malt and Malting_ (1895); W. J. Sykes and
A. R. Ling, _Principles and Practice of Brewing_ (1907); H. Van Laer
_Bull. de la soc. chim. de Belgique_ (1905), 337; R. Wahl, _Amer.
Brewers' Rev._ (1904), 18, 89. (A. R. L.*)