— 62 — 



of accuracy, better still with decinormal solution) have been added, is 

 titrated until it assumes a red colour. The first 250 cc. contain very nearly 

 the entire volatile acids, as the next 100 cc. invariably use up only 0,1 

 to 0,2 cc. of decinormal solution. From the quantity of potash solution 



required to neutralise the entire distillate the acid number II is calculated 

 for the weight of bergamot oil used. The difference between the saponi- 

 fication number of several pure oils which have been examined and the acid 

 number II determined in the manner described above, varied (as shown 

 in the table below, Nos. 1 to 7) from 5,2 to 6,9. Hence, unless further 



