36 ESSAYS AND OBSERVATIONS 



loured bodies, above relateci [N^ 24, 25, and 

 26,] J fince, in general, it is evident 6n<?ugh, 

 that they are owing to the different compo- 

 fitions of the lights with which they were 

 illuminated : the experiments with the 

 prifni [N° 27, 28.] are of themfelves a 

 fufficient commentary upon the reft. 



SECT. V. 



A Remark on Euler's Nova Theoria Lucis efe 

 Colorum. 



31. EuLER, in that treatife, (publifhed 

 lately along with fome other tradts, under 

 the title o^OpufcuJa Matbe?natica) endeavours 

 to amend the Hiiygcrian hypothefis of vibra- 

 tions, and fupport it againft the objedions 

 which made Neivton and his followers rejed: 

 it : we fliall not enter here upon the difcuf- 

 fion of that quertion ; as it would require a 

 difcourfe of confiderable length j and the 

 rather, that the Newtonian theory of light 

 and colours depends not on any particular 

 hypothefis with refped to the intimate nature 

 pf light (in like manner as his fyftem of u- 

 niyerfal gravitatipii is independent of all hy- 



pothefes 



