468 Mr. Coathupe on certain Modifications of the Powers 
(&.) A similar bottle containing camphor was placed ex- 
actly opposite to the first bottle, upon a stand near the west 
wall (the stove being thus at equal distances from each bottle, 
and not in a line between them). 
(c.) A third bottle containing camphor was placed in the 
centre of a line drawn between the door and the window, and 
exactly opposite to the stove, although at a distance of about 
1 3 feet from it. 
The temperature of the room varied at its extremes from 
44° Fahr. to 54°. 
After three days the camphor in the bottle in experiment 
{a.) had crystallized beautifully towards the east, .*. towards 
the light. 
That in bottle, experiment (&.) towards the west, opposite 
to the light. 
That in bottle, experiment (c.) tov>^ards the east and west, 
towards the coolest places. 
There was certainly rather more crystallization towards the 
east than towards the opposite side. A little also was appa- 
rent towards the north wall, opposite to the stove. 
{d,) A clean bottle containing a fragment of camphor was 
now placed near the window, which was covered by two glass 
receivers, leaving air spaces between the bottle and the first 
and second receiver of about f ths of an inch. 
The camphor showed no such particular tendency to cry- 
stallize towards the east as it had in experiment («.), but it 
crystallized nearly uniformly all over the upper concavity of 
the bottle. 
(e.) Decanters containing water were next substituted for 
the camphor bottles, and in each position the dew was in- 
variably deposited upon the same relative side of the decan- 
ter, as the camphor had crystallized when exposed in the 
stoppered bottles. 
In one of our glass houses (for I am unfortunately con- 
nected with the manufacture of glass) there is a small apart- 
ment about 9 feet long, 6 feet wide, and 7^ feet high, sepa- 
rated from the interior of the glass-house by a lath and 
plaster partition, which is hollow within, and comprehends 
a total thickness of 4j inches. This little apartment is oc- 
cupied by a superintendent of the founders crew. Opposite 
to a wide bench upon which this person reclines, there is a 
window through which he watches the progress of the fur- 
nace. This window is so constructed that one half of it can 
be slid behind the other half, to enable the ‘‘ surveillant’’ to 
protrude his head at a moment’s notice, to issue his orders. 
The window is glazed with glass of y\-th of an inch in thick- 
ness. It is 24 feet from the nearest point of the furnaee wbieh 
