during the Intense Trosf of 1776-7. $ 



Experiment 2. This night, about eleven, were 

 placed on the same wall the following liquors, viz. : 

 spirit of mindererus (which has since been termed 

 acetated ammonia), volatile spirits of sal ammoniac 

 (both kinds, mild and caustic), dulcified spirit of 

 nitre, red wine, and French brandy. 



January 29th. Barometer 29°, thermometer 9°, the 

 north-east wind excessively keen and piercing ; the 

 roads, which, by dint of great labour and expence, 

 had just been cut through, to enable carriages to pass, 

 were again completely drifted up. The several li- 

 quors above-mentioned, to my great surprise, now 

 showed evident marks of freezing. 



■Escperiment 3. They were suffered to remain all 

 night, and two more cups were placed near them, 

 with highly rectified spirit of wine (alcohol), and rec- 

 tified vitriolic aether. 



January 30th. The morning clear, but intensely 

 cold ; wind north-east ; barometer SOtV ; thermome- 

 ter sunk to 3°, viz. 29 degrees below the freezing 

 point ! a degree of cold which, I apprehend, has been 

 but rarely experienced in this climate, being consi- 

 derably below that of the remarkable frost of the year 

 1739-40*. And yet the above was not the greatest de- 

 gree of cold ; for (having no opportunity to examine the 



* The greatest degree of cold observed, during that uncom- 

 monly severe winter, was only 131, as appears from a record in 

 the Philosophical Transactions of London. 



