32 ESSAY III. 



5 oz. 5 drms. and 3 grs. : it had therefore lost 1 oz. 3 

 drms. and 30 grs. The receiver, which, with the water, had 

 originally weighed 4 oz. 2 drms. and 30 grs., now weighed 

 5 oz. and 3 drms., and 'had therefore gained 1 oz. and 30 

 grs. This gain, compared with the loss of the retort, shows 

 that the retort lost more by 3 drms. than the receiver 

 gained. These 3 drms. must have inevitably passed out of 

 the vessels in the form of vapour. 



SECTION VII. 



But from this inference we can deduce nothing towards 

 the determination of the point in dispute ; it was necessary 

 to examine more narrowly what had happened in the vessels. 

 But, before I give any account of that, I shall, for the sake 

 of perspicuity, briefly state what has been just said : 



oz. drms. grs. 

 The empty retort weighed .... 2 5 



The calcined fiuor 200 



The oil of vitriol 240 



Total weight before distillation ... 7 1 

 After it 5 5 30 



Loss 1. 3 30 



The empty receiver weighed .... 2 2 30 



The water put into it 200 



Total weight 4 2 30 



Weight after distillation 5 a 



Gain 1 30 



If we now deduct this gain from the above loss, 3 drms. 

 will be missing ; and they must have been dissipated in the 

 form of vapour. 



