178 Prvfemfr Tymdatt [April 8, 



the beam 'w^is in good eonditian and the bnlb well ctosen, seemed as 

 loud as tiiat of an oidiiiazy osgan-pipe. We have here the exact order 

 iz. _ ny fbraner expaJmente piOTed these gases to stand as 



: radiant heat. The amount of the abeoiption and the 

 11.: >.:- : -_e sound go hand in hand. 



Ii- Ir-lsr I proTed gaseous ammonia to be eTtremely imperdons 



- ■^'- i^t. My interest in its deportment when subjected to this 



- the^efoie great Plaong a small quantity of liquid 



ir cf the fia^s, and wanning the liquid slightly, the 



sent through ihe space above the liquid. A 



zaediately produced, 



TT of water intensted me most, and as I 



„ : . ~~ teiiij«eratTires it existed in sufficient 



iji_ . s. I heated a small quantity of water 



-r-^ ''■• P'^.^-i in the intermittent 

 I ^.„_^: — :. ; . erfnl mnsical sound 



produced by the partial condensation of the 



ler air of the flask, were however visible 

 It was necessary to prove that this haze 

 sound. The flask was therefore heated 

 the t^nperature of boiling water. The 

 c^ i^T bv a cxind^ised beam then revealed no trace of 



cl — *" !-"~'L From the perfectly invisible vapour 



h: - -. '-— rd, if anything, more forcible than 



liP^T- T i water until its temperature was 



rt : . to 10" C~ fully expecting that the sound would 



Tuish at tiii^ : :re ; but notwithstanding the tenuity of the 



Tapoor, the s*. "i:^ 1 from it was not only distinct but loud. 



Three ~ ' * with OTdinarj air were placed in a 



freezins n -- : : i of an hour. On being rapidly trans- 



fer " ' ~ ----- -z-h. louder than those 



Wis zl: 



MC« - — 



1 - 



^ _ = in the fla^e of a spirit-lamp tmtil aU 



- ■ a m ove d. 2^ i afterwards urging dried air 

 tl: 1 - i in t -T intermittent beam the sound 



in : falle:i . . :_ ■ to silence. 



r- 1 - - of a _\ tube. & - z of breath from the lun^ 



- r of pmito" _ I was immediately 



: -: lea. 



Wtrr.. -ji-' - - ''- '-- 7 '-to a dry fiask, the common air of the 

 '■—'-— - _ . • '"' - nds became immediately 



1 -'-^'. - - for the extraordinarj 



. T .: thi? L^~ r. ' 1 _• " ■ lem^ancy and diather- 



m-'vof . ^ " .revise thi^Ti sati&- 



- rged deportment 



- been most s::-i : : ii~ly de: ^ forming thos 



