. Practical text-book of plant physiology. Plant physiology. 156 COMPOSITION OF THE BODY. 5. Amount of fermentable sugar in the solution. Fill an Ein- horn's saccharimeter (See Fig. 82) with the solution after a little compressed yeast has been shaken up in it, taking care to fill the graduated limb of the instrument. The yeast must be active and free from fermentable car- bohydrates. Set the instrument in a warm place. After fermentation has r \j Fig 82. Einhorn's fermen tation saccharimeter. ceased the amount of C02 evolved is read off on the graduated scale. The figures will indicate direct
. Practical text-book of plant physiology. Plant physiology. 156 COMPOSITION OF THE BODY. 5. Amount of fermentable sugar in the solution. Fill an Ein- horn's saccharimeter (See Fig. 82) with the solution after a little compressed yeast has been shaken up in it, taking care to fill the graduated limb of the instrument. The yeast must be active and free from fermentable car- bohydrates. Set the instrument in a warm place. After fermentation has r \j Fig 82. Einhorn's fermen tation saccharimeter. ceased the amount of C02 evolved is read off on the graduated scale. The figures will indicate directly the amount of fermentable sugar in the solution. A control test should be made by taking a second instrument of the same kind and introducing water and some of the same yeast. The amount of carbon dioxide evolved in this way should be subtracted from the quantity in the other instrument. 6. Crystals of cane-sugar. Add strontia-water to the solution in con- siderable quantity, and after filte'r- .ing, evaporate the filtrate until a yellow amorphous precipitate begins to separate out. After it has stood for some time collect the precipitate and add to it dilute alcohol and de- compose it with carbon dioxide. Filter this solution and re- duce the solution somewhat by evaporation. Add 95 per-cent. alcohol until a precipitate begins to form; add a crystal of cane- sugar to induce general crystallization and allow to stand. Cane- sugar crystals are characteristic in form (See Fig. 83). If the above experiments indicate the presence of cane-sugar and glucoses in the solution, the remainder of the extract should be divided into two equal parts and treated as follows : 1. Determine the quantity of reducing sugar (glucoses and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original MacDougal, Daniel Trembly, 1865-1958. Ne
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