Luminous Appearance produced by Sugar. 407 
- In Englith as follows :— ; 
To Him 
Who rooted out the moft difgraceful of public Evils, 
- Tdlenefs and Mendicity ; 
Who relieved and inftruéted the Poor, 
And founded many Inftitutions 
For the Education of our Youth; 
Go, Wanderer! 
Strive to equal him 
In Genius and Activity, 
: And us 
In Gratitude! 
That Count Rumford may long live to enjoy the heart~ 
felt fatisfaQion that muft refult from the contemplation of 
the fuccefs of his labours in promoting the happinefs of man- 
_ kind, muift be the fincere with of every lover of {cience, and 
of every true friend to virtue and morality, 
LUMINOUS APPEARANCE PRODUCED BY SUGAR, 
In the procefs of breaking fine white fugar in a dark apart- 
ment, a very perceptible luminous appearance is. obferved, 
the caufe of which is as much unknown to us as that pro- 
duced by rubbing againft each other two flints, particularly 
thofe of Iceland, The following is offered by Dr. Juch*, of 
Wiirzburg, as a kind of explanation of this phenomenon: 
** While breaking refined fugar,”’ fays he, * in fmal] 
pieces with a hammer and blunt knife, I fuddenly perceived 
a very fingular fmell,- which had a great refemblance to that 
of fuming nitrous acid. I looked immediately round me to 
fee whether fome vefiel containing that acid might not be in 
the neighbourhood ; but I faw none, and was certain that 
nothing of the kind had been in the room. I then examined- / 
the cirenmftance more narrowly, and found, on breaking fine 
fugar, that a fmell fimilar to that of aquafortis was always. 
perceived by every perfon prefent. 
“This fimultaneous difengagement of light, and of the {mell 
of nitrous acid, I explain in the following manner :—When 
¥ In Scherer’s Journal der Chemie, Now 10+ 
fugar 
