426 MEMOIR OF THE LATE DR THOMAS CHARLES HOPE. 
contended could not have happened, if liquids had been absolute non-conductors 
of caloric. 
These experiments seem sufficiently conclusive; but Count RumForp still 
insisted, that the rise of the thermometer was only owing to the conduction by 
the sides of the containing vessel, in Hopr’s experiments, as well as in the 
analogous investigations of THomson, NicHonson, and Darton. 
This objection suggested to the late Dr Joun Murray the ingenious idea of 
employing a hollow cylinder of ice as the containing vessel ; which, as its tem- 
perature could not rise above 32°, could not conduct or communicate any heat to 
the thermometer. Water could not be employed in this apparatus, on account 
of its anomaly in expanding by cold near its freezing point; but olive-oil, 
cooled to 32°, was used; and in experiments made by suspending the heating 
cause in contact with the surface of the oil, the thermometer rose, in a longer or 
shorter interval, in proportion to the greater or less depth of the instrument below 
the surface of the oil~—(Wicholson’s Journal, 8vo series, I. 425.) 
In considering these experiments and the objections stated, it occurred to 
me, that if the same apparatus were employed with different fluids, did the rise 
of the thermometer depend on the conduction of the sides of the vessel, that rise 
should be nearly equal, whichever liquid was employed. I tried this with ten 
different Jiquids; and though the apparatus was the same, and the distance 
between the source of heat and the thermometer similar, yet the time required to 
raise the thermometer to the same point, was very different with the different 
liquids: this I ascribed to the difference in the conducting power of each liquid.— — 
(Nicholson’s Journal, XII. 137, for 1805.) 
All these investigations confirmed the view taken by Hops, that though 
liquids were very slow conductors of caloric, they could not be considered, as was r 
alleged by Rumrorp, absolute non-conductors. | ' 
Dr Hore’s reputation as a teacher of chemistry, arising from the causes — 
already noticed, and his tact in exciting in his hearers his own enthusiasm for ‘ 
the study, long continued to attract vast crowds of pupils. His honours kept 
pace with his reputation. 
In 1810 he was elected a Fellow of the Royal Society of London ; in 1815 he © 
was chosen President of the Royal College of Physicians of Edinburgh, an office 
which he continued to fill for four successive years; in 1820 he was admitted an 
honorary member of the Royal Irish Academy ; and in 1823 he became one of the 
Vice-Presidents of this Society, an office which he held until his death. During his 
connection with the College of Physicians, he took an activé part in the prepara- ; 
tion of the ninth and tenth editions of their Pharmacopeeia, especially in that 
published in 1817. For several years, besides his duties as a Professor of Che- 
mistry, Dr Hore gave an annual course of Clinical Medicine in this University, 
which was also numerously attended. But for many years before his death, he 
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