388 Mr. Jferapath on True Temperature, &>c. [Nov. 



consequently the inferiority of the water to be the least, the 

 contrary was observed, and the inferiority was as great as in 

 almost any other instance. Part of this, however, might, I con- 

 ceive, have arisen from the strong current of air which, for a 

 great while, was allowed to pass through the room ; but further 

 experiments are wanting to settle this matter. 



it is observable that the inferiority of temperature is sensibly 

 greater in the right hand water glass than in the left ; but as the 

 figures of the glasses were dissimilar, and I did not take the 

 precaution to weigh the quantities of water, nothing can be 

 determined from it. 



I might now carry my inquiries into the phaenomena of radia- 

 tion and dew ; and I might easily demonstrate the cause and 

 consequences of things of this nature, and show that all the 

 phaeaojaaeng which have been observed by Leslie, Delaroche, 

 Kumford, Dulong and Petit, Dufay, Williams, Barker, Wells,* 

 Sic. flow from the simple principles I have developed ; but the 

 full discussion of these subjects requires a great scope both of 

 time and space. ■ Should I not shortly enter on these things, 

 I shall endeavour to unfold my views on these and a variety of 

 others in a work I have in part promised my friends to bring to 

 press as soon a,s 300 copies are subscribed for; namely, the 

 Lectures I have for some years been accustomed to give my 

 pupils on the various branches of Natural Philosophy. If this 

 work be printed, I shall endeavour, while giving an easy and a 

 popular elucidation of the various subjects in question, to make 

 it not unworthy of the consultation of the philosopher. 



(To if ciwtillltt'j.) 



* When I had nearly dosed the present part of this paper, I had the pleasure of 

 receiving from John Wyatt Dobbs, Lsq. through the medium of the Rev. H. S. Trim- 

 mer, a copy of Dr. We'Bs ! 'f; excellent " Essay on Dew." The copious detail of pheno- 

 mena in this woek induced me to lay aside my thoughts of publisliing a mere abstract of 

 my ideas on the phaenqmena of dew in the present paper, and to reserve them until J 

 should have a better opportunity of doing them justice. The same gentleman has also 

 since had the goodness to send me a copy of the Philosophical Transactions, containing 

 Dr. Lire's paper on tli* elastic force of vapours, which in the subsequent Proposition, I 

 mention a^ not having at hand. Though the kindness of Mr. Dobbs has nofortivnately 

 *ome too late to afford me time for re-investigating the invariables of the theorem I 

 have given in Prop. XV. it has, however, I am happy to say, prevented me from run- 

 ning into 3 great mistake with respect to the merit and accuracy of Dr. Ure's theo- 

 rem into which I had fallen from a mistranscribed account of it by another. 



