The factors controlling the conversion reaction have been determined.;The decomposition of levulose under conditions of high acidity and, temperature has been studied, and the limiting conditions have been determined.;Conversion experiments under varying conditions of concentration and acidity have been run, and the data are presented in the form of tables and graphs.;Normality-pH data for different concentrations of juice treated with varying, quantities of sulfuric and hydrochloric acids have been determined.;A table has been prepared which shows the amount of sulfuric or hydrochloric acid required to convert a juice of any concentration from 4 to 40% total solids in one hour at 80°C. Sufficient date are presented to enable the calculation of similar tables for different periods of time.;Details of the methods used for the desiccation of two and a half tons of Jerusalem artichoke tubers have been given. Possible improvements in the drying equipment, have been presented.;Designs for several new pieces of equipment have been presented, including a continuous extraction unit, a continuous precipitation unit, and a carbonator.;Details of a new and improved process for the isolation of levulose as calcium levulate have been presented.