This can also be obtained either directly, by weighing or measuring a sample into an open dish, driving off the moisture at 100° 0. until a constant weight is obtained, or indirectly, by calculation from the specific gravity of the dealcoholized solution. For the direct estimation a small quantity should be weighed out; 10 grams is quite sufficient, and 5 grams gives still better results. This is allowed to run out into a thin film on the bottom of a shallow dish having an area of several square inches. In this shape it is very readily dried to a constant weight at 100° C, while if a larger quantity is taken this becomes quite difficult, and it is necessary to use a higher temperature.1

In case the indirect method is used the per cent. of extract may be obtained from one of the various tables in use or by dividing the difference between the specific gravity and 1.000 by the factor 3.86. The result obtained is the number of grams of solid matter in 100cc. of the beer, and must be divided by the specific gravity of the original beer to get the exact per cent.