N. C. AGRICULTURAL EXPERIMENT STATION. 
The interior of a bath of this size, and even much smaller, cannot 
be raised to the temperature of 100°C. by boiling water. We use a 
mixture of glycerol and water of such specific gravity as to give 
100°C. The proportions of glycerol and water will depend on the 
size of the bath, and will have to be determined by experiment in 
each case. 
2. Insoluble Phosphokic Acid Bath. 
The bath is of galvanized iron, and sufficiently large to carry 12 
flasks, which are held, as shown in the cut, in an upright position 
by means of spring clamps (A) at the top, and by fitting into the 
spaces of removed sections of the same size as the flasks of a skele¬ 
ton disk (B) near the bottom of the bath. 
1 ^ 
Fig. II.— Insoluble Phosphoric-Acid Bath. 
