. Carnegie Institution of Washington publication. CANE SUGAR. 121 and which remedied the "lurching" effects of the older method of adjustment, was introduced. 4. The addition to our equipment which gave the most satisfaction, and which proved to be the most indispensable of all our instruments— if comparisons are legitimate in a work whose success depends on the perfection of every one of a multitude of conditions—was a Schimdt and Hansen saccharimeter of the best construction. It is to be remembered in this connection that, in Series I, we had no means of ascertaining what had occur
. Carnegie Institution of Washington publication. CANE SUGAR. 121 and which remedied the "lurching" effects of the older method of adjustment, was introduced. 4. The addition to our equipment which gave the most satisfaction, and which proved to be the most indispensable of all our instruments— if comparisons are legitimate in a work whose success depends on the perfection of every one of a multitude of conditions—was a Schimdt and Hansen saccharimeter of the best construction. It is to be remembered in this connection that, in Series I, we had no means of ascertaining what had occurred in the solutions while in the cells except the test of Fehling and the examination of the solvent in which the porous part of the cells was immersed; also that, having found no solute in the latter, and but little invert sugar by the former, we were obliged to conclude, from the evidence available, that the solutions had maintained their concentration without much altera-. Fig. 49.—Interior view of water compartment with covers partly removed, (e) and (e') air tubes; (b) tube for circulating water. No devices for heating or cooling the water. tion of the solute. If this conclusion were correct, and it was believed to be so in the main, the results of the measurements of Series I were trustworthy and furnished strong experimental evidence in support of the deductions of van't Hoff. It had been suspected, however, that the inversion occurring in the cells was somewhat larger than it had been found to be by the method of Fehling, and the object sought by the introduction of the polariscope into the investigation was to measure this supposed greater inversion by the more accurate optical method. The quantity of invert sugar was to be measured by the loss in rotation, and one-half the pressure- equivalent of the invert sugar so found was to be deducted from the observed pressure, in order to arrive at the correct osmotic pressure of the original solution of cane Pl
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