1788. 



Nov. 3. 



Mr Small on 

 ventilation. 



Spirits diftilled 

 from carrots. 



28 HIS TORT of the SOCIETr. 



Phyf. CI. Mr Dalzel read an Eflay on Ventilation, by 

 Alexander Small, Efquire. 



At the fame Meeting, a Report was prefented from Dr 

 Black, Dr Hutton, and Mr Russell, on Dr Hunger and 

 Mr Hornby's procefs for producing an ardent fpirit from 

 carrots. [See fupra> March 3. 1788.] The report is as follows ; 



We have examined the fample of fpirits, which was fent by 

 Dr Hunter of York to the Royal Society, and we have read 

 the account of the experiment on the fermentation and diftilla- 

 tion of carrots by which the faid fpirit was produced. The 

 experiment was made by Mr Thomas Hornby, druggift in 

 York, with one ton and eight ftone of carrots, which, after 

 being expofed to the air a few days to dry, weighed 160 ftone, 

 and meafured 42 bufhels ; they were warned, topped and tailed, 

 by which they loft in weight 1 1 ftone, and in meafure feven bu- 

 fhels ; being then cut, they were boiled with the proportion of 

 24 gallons of water to one third of the above quantity of car- 

 rots, until the whole was reduced to a tender pulp, which was 

 done in three hours boiling. From this pulp, the juice was 

 eafily extracted by means of a prefs, and 200 gallons of juice 

 were produced from the whole. This juice was boiled again 

 with one pound of hops five hours, and then cooled to 66 of 

 Fahrenheit, and fix quarts of yeaft being added, it was fet 

 to ferment. The ftrong fermentation lafted 48 hours, during 

 which time the heat abated to 58 of Fahrenheit; 12 gallons 

 of unfermented juice, which had been referved, were then 

 heated and added to the liquor, the heat of which was thus 

 raifed again to 66 t and the fermentation was renewed for 24 

 hours more, the air of the brewhoufe being all this time at 

 46 and 44. The liquor was now turned, and continued to 

 work three days from the bung ; and, laftly, it was diftilled, 

 and the firft diftillation was rectified next day without any ad- 

 dition, 



