42 



PROCKEDIXGS OF THE CANADIAN INSTITUTE. 



From this series it appears that, while there is a fair approach to 

 constancy in the quantity of volatile acid distilled over, tliere is a 

 relative increase for lessening amounts of fat used. To find whether 

 this was still observable with a larger (pi'oportional) distillate^ the 

 next series of experiments was undertaken. In these the distillate 

 collected was three-fourths as great as the total quantity of liquid in 

 the distillation-flask. 



SERIES III. 



A remarkable constancy in the acidity of the distillate, calculated 

 on the fat used, is observable in this series, and seems to indicate 

 that under the given conditions, the percentage of acid distilled over 

 is constant. Experiment 10 is not to be counted, except as an 

 illustration of the amount of error that may occur through not pro- 

 perly cooling the distillate before filtering. This filtrate became 

 distinctly turbid on cooling (a circumstance noted at the time), 

 although the results were allowed to stand. 



In all the pz*eceding experiments the delivery tube of the con- 

 denser merely entered the receiving graduate, not reaching to the 

 bottom of it. In the following experiments the tube reached to the 

 bottom of the graduate, and dipped into 20 c.c. of distilled water at 

 the beginning of the experiments, and the aspirated air bubbled 

 through the distillate during the whole of the operation. 



SERIES IV. 



Potash. 



31.9 c.c. 

 34.7 " 

 15.6 " 



38.5 " 

 26.9 " 



22.6 " 



Acid. 



63.8 C.c. 

 69.4 " 

 31.2 " 

 77.0 " 

 53.8 " 

 45.2 " 



Distillate. 



71.8 + 20 



78.1 + 20 



35. 1 -f 20 



86.6 + 20 



60.5 + 20 



50.8 -t- 20 



Total 

 Acidity. 



13.9 c.c. 

 15.85 " 



7.4 " 

 16.6 " 

 11.6 " 



9.6 " 



Acidity per 

 gram fat. 



4.36 c.c. 

 4.56 " 

 4.74 " 

 4.31 " 

 4.31 " 

 4.24 " 



