VOL. LXXII.] 



PHILOSOPHICAL TRANSACTIONS. 



295 



A Table showing tie Solubility or Insolubility of 



Alcohol. 



Substances. 



fNeut. \ 



-g 

 'o 



M 



o 



Metal. 



Earthy 



fNeut. 



S < Metal. 



o 



Earthy 



Vitriolated tartar. 

 Glauber's salt. 

 Vitriolic ammoniac 

 Vitriol of silver. 



mercury. 



copper. 



Heavy spar. 

 Selenite. 

 Alum. 

 Epsom salt. 

 Nitre. 



Cubic nitre. 

 Nitrous ammoniac. 

 Nitre of silver. 



-mercury, 

 copper. 



-lead. 



Calcareous. 



Results. 



r 



Neut. 



3 



Earthy. 



Insoluble m 



Insoluble m 



Insoluble M.'rS 



Insoluble M.I « 



Insoluble ula < Metal. ) 



Insoluble M 



Insoluble m 



Insoluble.* 



Insoluble.* 



Insoluble m 



Insoluble.* 



Soluble.* 



Soluble m. 



Soluble m. 



Soluble m. 



Soluble m. 



Insoluble M.£§ 



Soluble M. I 



Soluble.* 



Soluble m. 



Neut. 



> 





)Neut. 3 



L Metal. 



XXI. New Fundamental Experiments on the Collision of Bodies. By Mr. John 



Smeaton, F. R.S. p. 337. 



It is universally acknowledged, that the first simple principles of science 

 cannot be too critically examined, in order to their being firmly established ; more 

 especially those which relate to the practical and operative parts of mechanics, 

 on which much of the active business of mankind depends. A sentiment of 

 this kind occasioned my tract on mechanic power, published in the Philos. 

 Trans., for 1776 (abridg. vol. 14, p. 71). What I have now to offer was in- 

 tended as a supplement to that, and the experiments were then in part tried ; but 

 the completion of them was deferred at that time, partly from want of leisure; 

 partly to avoid too great a length of the paper itself; and partly to avoid the 

 bringing forward too many points at once. My present purpose is to show, that 

 the true doctrine of the collision of bodies hangs as it were on the same hook, 

 as the doctrine of the gradual generation of motion from rest, considered in that 

 paper ; that is, that whether bodies are put into gradual motion, and uniformly 

 accelerated from rest to any given velocity; or are put in motion, in an instanta- 

 neous manner, when bodies of any kind strike one another ; the motion, or sum 

 of the motions produced, has the same relation to mechanic power there defined, 

 which is necessary to produce the motion desired. To prove this, and at the 

 same time to show some capital mistakes in principle, which have been assumed 

 as indisputable truths by men of great learning, is the reason of my now pur- 

 suing the same subject. 



I do not mean to point out the particular mistakes which have been made by 



