On Heat and Light as transmitted through Glass. 467 
Copernicans who never expressed their opinion in print, and 
it must be noted that Harriot had been styled a profounde 
mathematician” as early as 1593*. 
In Caxton’s Ymage or Myrour of the Worlde,” printed 
in 1482, the world and its inhabitants are compared to a large 
apple surrounded with flies. I mention this, not that it has 
any relation to the subject in hand, but because I met with 
it while pursuing these researches, and because it ought al- 
ways to be quoted in connexion with the most improbable and 
absur( I tale of Sir Isaac Newton and the gravitation apple, which 
is gravely inserted in work after work. What a pity it is 
that no such tale has been invented to commemorate the dis- 
covery of Copernicus ! for notwithstanding the prophecy of 
Rheinhold, his reputation requires it more than that of New- 
ton: — Tota posteritas grato animo Copernici nomen cele- 
bravit, cujuslabore et studio, doctrina ipsa coelestium motuum 
propemodum collapsa iterum restituta est: et magna ejus 
quoque lux, Dei beneficio accensa, inventis et patefactis ab 
eo multis, quae ad hanc usque aetatem vel ignota vel ob- 
scura.” 
35, Alfred Place, London, March 7, 1840. 
LXIX. On certain Modifications of the Powers of Heat and 
Light nsohen transmitted through Glass. By Charles T. 
CoATHUPE, Esq. 
To the Editors of the Philosophical Magazine and Journal, 
Gentlemen, 
^HOULD the following observations On certain modifi- 
^ cations of the powers of heat and light when transmitted 
through glass” appear to you to be a pertinent sequel to some 
of the experiments of Professor Draper of New York, which 
are recorded in the London and Edinb. Phil. Magazine for 
February 1840, they are presented to you with the author’s 
best respects. 
In a room about 16 feet square, having a window about 
6 feet square in its eastern side, a small stove in the centre 
of its southern side, a door communicating with a passage at 
the northern end of the western side, and a blank wall con- 
stituting the north side, the following experiments were made. 
(«.) A small 4-ounce stoppered bottle containing a frag- 
ment of camphor was placed upon a table near the centre of 
the window that occupied the middle portion of the eastern 
side of the room. 
* Pierce's Supererogation, by Gabriel Harvey, p. 190- 
2 12 
