ATOMIC PHI NCI PLEB OF CHEMISTRY. l^$ 



cations, appeared to resolve , itself into them Bgain ; as <he 

 sheet broke part of it seemed to mount up into a higher 

 and comparatively calm region, and formed itself into cirro" 

 cumuluSi in some places disposed like windrows of hay, in 

 others consisting: of small roundish nubeculse of various 

 sizes; and into cirro-stratus, consisting either of flat sheets 

 of thin vapour with dentated edges, or disposed in streaks: 

 other parts of the once continuous sheet of nimbus descended 

 into a lower region, and floated along in flocks of cumulus, 

 with a strong wind, and the day became very fine. In the 

 evening the distinct modifications again seemed lost in a 

 general mistiness of the atmosphere, which as it became 

 darker seemed very red coloured, and this vapour was seen 

 to thicken in particular places which became dense nitnbi 

 again, and gave forth vivid flashes of lightning, and thunder 

 storms continued through the night. 



From the evident decrease in the quantity of cloud dur« 

 ing the fine part of the day, it is evident, that, while part of 

 the sheet of nimbus, which obscured the sky in the morning, 

 divided itself again into the several modifications, the col- 

 lision of which originally formed it; great part must have 

 been absorbed by the air* : this is farther probable from the 

 great transparency and dense blue colour of the sky between 

 the clouds. 



The insertion of these observations in your next number 

 will, if convenient, oblige your constant reader, 



Clapton, Hackney, THOMAS FORSTER. 



May 21, 1811. 



XI n. 



Observations on Dr, Bostock*s Review of the Atomic 

 Principles of Chemistry, ify John Dalton, 



To Mr. NICHOLSON. 

 SIR, 



il. Bostock's dissertation on the atomic system of o^e- d^ g ,-t^^j^,5 

 mistry in your Journal (Vol. XX VIII, page 280) may be remarks on ihe 



* See Mr. Van Mons's paper iu your Journal for September, 1809 j 

 Also Rees*i Cyclopedia, article Cloud. 



divided 



I 



