116 
Quantity of 
Barwin. 
(1) 0°5 gr. in 
5 portions. 
(2) 0-1 gr. in 
1 portion. 
(3) 0:01 gr. 
(4) 0-001 er. 
(5) 0-0001 gr. 
Harriny—An Investigation of the Connexion between 
Barium. 
Barium nitrate Ba(NO,), was the salt used. 
Description of Spectrum. 
A strong banded spectrum in the red, orange, green, and blue. 
7318 
Red | 
l6718 
Between 6718 and 5586 there are several bands, composed of 
flutings with well-defined edges on the more refrangible side, 
described as composite bands. Following these are four simple 
or diffuse bands in the green, which have the same intensity on 
both sides and are very strong. 
5426) 5346 5170 4904 
5370] 5232 5840 4842 
strong. Feeble bands at \ 6530, 6320, and 6040. 
\ 
A line \ 5536 is very strong. A continuous spectrum extends 
very feebly to the violet. 
The spectrum is much weakened. A number of the fine red 
bands have disappeared. The broad diffuse bands have become 
narrower as well as more feeble. 
The strong band commencing about \ 7000 and that com- 
mencing about \ 5080 are barely seen; all other bands have 
disappeared. The line d 5536 is still strong. 
There are no bands, and the line A 5536 has become very 
faint. 
No spectrum but the sodium line. 
MeraLuic SILVER. 
Description of Spectrum. 
Two groups of bands of different characters; in one, the bands are diffuse and 
degraded equally on either side. This group lies between 14700 and 4300. 
The second group is altogether different; it may be termed a composite band 
composed of a number of fine lines, degraded towards the red, the lines not only 
