5^t ExptrimetUs on the Tranftviffion of Heat thttugh Fluids. 



31', C in 106' ; a length of time abfolutely Incompatible with every idea refpefting tranf- 

 mitted caloric. It is not poffible, then, that the thermometers could have rifen in con- 

 fequence of the adtion of tranfmitted caloric. 



2. If the caloric had been conduced to the thermometers by the veflel, C, which was 

 always neareft the veflel, ought to have rifen firft, or at leaft, as its fituation was precifely 

 the fame, it ought to have rifen the fame number of degrees in experiments 3d and 4th. 

 In thefe the hot oil was the fame ; it ought therefore to have communicated the fame 

 quantity of caloric to the veflel : but in experiment 3d, C rofe both fooner and higher than 

 in experiment 4th. This is cafily explained, on the fuppofirion that water is a worfe con- 

 du&or than mercury ; but it is inexplicable, on the fuppofition that the heat was com- 

 municated by the vefl'el. The following experiment proves clearly that this fuppofition is 

 without foundation. 



To determine whether the cold liquid was thrown into waves, or whether currents were 

 formed in it either by pouring the hot liquid over it, or during the procefs of heating, I took 

 a folution of carbonate of pot-afli, with amber floating through it, prepared in the way de- 

 Tcribed by Count Rumford, and poured it into the veflel M till it fl:ood 0.3 inch above the 

 thermometer B. Over this was poured cold water to the height of half an inch. The 

 two furfaces kept perfeftly diftin£l, as was evident from the amber, fome of which was 

 floating at the furface of the carbonate. Over all I poured boiling water, tinged blue with 

 the juice of red cabbage. The blue colour hung down in clouds through rather more than 

 the half of the pure water ; but none of it approached the carbonate. The temperature of 

 the carbonate was 40° (that of the air). Thermometer B rofe during the pouring to 73'. 

 Thermometers A and C placed as in experiment ift. The refult of this experiment was 

 as follows : ' 



EXPERIMENT VI. 



Time. 



