Part 3

Pulverized Boiling 12.05 .63 Pulverized Percolated 12.78 .71 Pulverized Boiled with egg 12.85 1.05 Pulverized Filtered 12.31 .72 Medium Boiling 15.89 .83 Medium Percolated 22.94 1.29 Medium Boiled with egg 16.71 1.29 Medium Filtered 30.00 1.73 Coarse Boiling 19.79 1.03 Coarse Percolated 27.52 1.54 Coarse Boiled with egg 21.27 1.56

Hence it is apparent that pulverizing is the most efficient method of grinding. The best brew is made by filtration. Boiling with egg is second best while plain boiling and percolation are the poorest of all. In general, strength and color of the brew are quite independent of the blend and price but depend upon the grind. The flavor, however, varies markedly with the coffee brand and price. Java, Sumatra and Bogota give weaker infusions under the same conditions than do Mocha and Santos. The order of preference for flavor stood--Java, Sumatra, Santos, Bogota and Mocha. It was also observed that coffee which had stood long after grinding gave an infusion of a lower specific gravity and hence of impaired strength.

The effect of adding sugar and cream to coffee is not well understood. Some assert that the fat of cream and the fats of the coffee bean form indigestible compounds, but there is scarcely sufficient experimental evidence to justify this. The tannin compounds in coffee are apparently not precipitated, as has frequently been stated, by the addition of sugar and cream. Testing a centrifuged cream from a beverage coffee gave no appreciable evidence of tannin while the remaining coffee infusion gave the normal positive tests for tannin. It is certainly true, however, according to one authority that black coffee without any additional substances, with the possible exception of a portion of sugar, is the most beneficial form of the beverage.

Transcriber’s Note:

Words and phrases in italics are surrounded by underscores, _like this_; those in bold are surrounded by equal signs, =like this=. Obvious printing errors, such as partially printed letters and punctuation, were corrected. Three misspelled words were corrected.