133 
is observed, very similar to that in Mr. Brothers’s photograph 
In all three, taken at an interval between each of about a 
minute and a half, the nebulous appearance appears situated 
on three quarters of the limb, the remainder being quite 
free. There are also indications of a radial structure, so that 
he thinks it highly probable that the representations are 
actually those of the corona. 
Since communicating the above, he has carefully exa- 
mined the two other photographs of the sun which he 
possesses, and which were taken early in the month of 
November, 1858. These, one of which must have been ex- 
posed at about 2 hours 20 minutes after the other, present 
nothing remarkable to the naked eye ; but when viewed 
through a glass of moderate power, a thin crescent-shaped 
envelope is observed on each, with this remarkable circum- 
stance, viz., that in the two it appears on opposite limbs, 
suggesting the idea of a semi-revolution in the above inter- 
val of time at a velocity not much less than that due to 
Kepler’s law of planetary motion. In one of the photo- 
graphs there is, under the crescent and apparently on the 
rim of the sun itself, a narrow band in breadth about 300 of 
the diameter of the disk, and of at least double the intensity 
of the sun. This may probably be referred to the actinic 
action of the chromosphere and the red flames. 
“On Anthraflavic Acid, a Yellow Colouring Matter accom- 
panying Artificial Alizarine,” by Edward Schunck, Ph.D., 
F.R.S., V.P. 
The artificial formation of alizarine is a process of so 
much importance both theoretically and practically, being 
in fact the first instance in which a natural colouring matter 
has been produced by artificial means, that everything con- 
nected with it must in the eyes of the chemist possess more 
or less importance, especially when we consider that it is 
chiefly to alizarine that madder owes its valuable dyeing 
