500 Mr. Tovey’s Researches in the 
existence of which as a constituent I could not determine at 
all, and which the quantities of the other constituents would 
appear absolutely to exclude. It is therefore necessary to ex- 
amine whether any other method of arrangement is more sa- 
tisfactory. 
From the researches on oxamide, benzamide, &c. it follows, 
that by the action of ammonia on an oxide there may be 
formed water and a compound of the body N H? with the 
base of the oxide. If we consider this to have taken place in 
white precipitate, we should have the formula 
(2 Cl+ Hg) +(2 N H’+Heg), giving 
2Hg = 405°60 or, per cent. 79°73 
2 Cl = 70°84° 13°93 
Q9NH? = 32°30 6°34; 
and this compound should yield on analysis, on being decom- 
posed, 6°73 per cent. of ammonia. 
The question whether ammonia in acting on metallic oxides 
forms water and metallic amides is one of the most interest- 
ing now requiring to be examined; but notwithstanding the 
bearing the results just described have on the question, I do 
not wish to adopt too positively the opinion that white preci- 
pitate is a compound of deutochloride and deutamide of 
mercury until more extended researches shall enable me to 
argue from a greater number of facts derived from the reac- 
tions with other metals. 
LXXXVI. Researches in the Undulatory Theory of Light, 
in continuation of former Papers. By Joun Tovey, Esq. 
To the Editors of the Philosophical Magazine and Journal. 
GENTLEMEN, 
i NOW proceed, as I proposed at the conclusion of my last 
paper, p. 272, to integrate the equations 
dé cid? ey eds 
d@ dx iPr d x 
dy, Lier a d*y, 
i fae + Ss; “Aaa + &c. (1.) 
+ &c. 
oh dle 
de oN dx? + $y dat + &e. 
As € is, by supposition, a function of x and 4, we can put 
