A 



JOURNAL 



OF 



NATURAL PHILOSOPHY, CHEMISTRY, 



AND 



THE ARTS. 

 . SUPPLEMENT TO VOL, XF. 



ARTICLE I. 



Observations and Experiments to shew that the Effects 

 ascribed by Mr. Dispan to the perpendicular Descent of 

 Hoar Frost are not so general as to support his Theory, 

 In a Letter from John Gough, Esq* 



Sir, 



To Mr. Nicholson. 



Middle shazD^ Dec. 8/A, 1806. 



.N ingenious memoir on congelation in Spring and Dispan on the 

 Autumn appeared in your Journal for November ; in ^ater^^ex^ os^d 

 which the writer, M. Dispan, mentions certain experi- to the air in 

 ments on the authority of a Parisian philosopher. Uethemght. 

 was informed by this gentleman, that if several plates of 

 water be exposed to the air in a frosty evening, one of 

 which is covered with a pane of glass, &c. the water ia 

 the open vessels will freeze, but the contents of the 

 covered plate will remain fluid. The same person also 

 observed, that if a funnel be suspended in the evening, at 

 a moderate distance, over a plate of water broader than 



Vol, XV. — Supplement. A a a itself, 



