240 J. E.. Loughlin on Fluorescence. 
several valuable conclusions. He was the first toexamine the | — 
fluorescent nature of glass colored by oxyd of uranium. 
In June of the present year, 1 commenced a series of experi- iE 
ments upon the tinctures and infusions of the leaves, barks, and i 
roots of various plants. A beam of sunlight was the agent em- 
ployed for illumination. The apparatus, ‘that of Prof. Stokes. F 
Of the specimens examined, those worthy of note, with their ah 
results, are given in the following table: q 
Tinct. of Quassia root, , light green. | 
Jeratrum viride leaves, greenish-yellow. 
- Aconite root, orange-yellow. 
~ Opium, greenish-yello 
a Belladonna leaves, yellowish-green. 
i Stramonium leaves, light green. 
f Nux vomiea root, ell 
The tinctures were then deprived of color by being filtered 7 
through animal charcoal, the object being to remove the color- 
ing matter, as several of them gave reactions which were due to 
the presence of chlorophyll. On an examination they gave the 7 
following results: re 
Tinct. of Quassia, light green. 
. eratrum viride, yellowish-green 
a conite, yellowish-green 7 
- Opium deep yellow tint. qd, 
* Belladonna, yellowish-green. 4 
a Stramonium, light green. ql 
- Nux vomica, light green. 
Tinct. of Nux vomica deserves more than passing notice; 
when deprived of color it gave a faint green tint in place of the 
original yellow tint. All the alkaloids of the above that could 
be obtained were examined, viz: 
Quassia, distinct light green. Codeia, faint green passing to 
Veratria, yellowish-green. | ge. 
Aconitia, yellowish-green. sia soe yellowish green. | 
Morphia, yeHow. Strychnia, faint green passing ¢? 
N. i ow. orange. 
a 
phur served as the illuminating agent. The intensity of 
varied as is shown in the table. 
Paper. Liquid. 
Infusion of Esculin, distinct, distinct. 
s Cinchona, pal distinct. 
; 5, ge 
1 Quassia, pale, distinct. 
