> 
», ELE 
PHYSICAL anp LITERARY. 39 
related [N° 24. 25. and 26.]3 fince, in 
general, it is evident enough, that they 
are owing to the different compofitions of 
the lights with which they were illumina- 
ted: The experiments with the prifm [N° 
27.28.] are of themfelves a fufficient com- 
mentary upon the reft. 
Si G: Ta Vv. 
A Remark on EULER’s Nova Theoria Lucis 
et Colorum, 
31. EuLER, in that treatife, (publifh- 
ed lately along with fome other tracts, un- 
der the title of Opufcula Mathematica), en- 
deavours to amend the Huygenian hypo- 
thefis of vibrations, and fupport it againft 
the objections which made Newton and 
his followers reject it: Wefhall not enter 
here upon the difcuffion of that queftion; 
as it would require a difcourfe of con- 
fiderable length; and the rather, that the 
Newtonian theory of light and colours 
depends not on any particular hypothefis 
with 
