74 E. HAANEL ON THE APPLICATION OF HYDRIODIC ACID, Erc. 
On the application of Hydriodic Acid as a Blowpipe-reagent. 
EXPLANATION oF PLATES. 
The first three plates contain representations of coatings of various elements obtained on plaster 
of Paris tablets, by the use of hydriodic acid. Fig. 9, Plate II, representing the coating obtained 
from silver, per se, is an exception. 
On Plate IV a number of coatings are represented in illustration of separations of elements 
effected by hydriodic acid. 
PLATE I.+ 
. Arsenic. 
. Lead. 
. Antimony. 
bo oe 
em oO 
. Mercury. 
. Tellurium. 
or 
Prare IL + 
Tin. 
Selenium. * 
Thallium. 
Silver, per se. 
10. Copper. 
SOU OOS tap 
Puate III. ¢ 
. Molybdenum. 
. Silver (hot). 
3. Bismuth. * 
. Tungsten. * 
. Bismuth (after treatment with ammonia). 
Prats IV. 
. Amalgam. 
. Lehrbachite. * 
. Kobellite. 
. Chilenite (sketched while hot), * 
. Nagyagite, * 
* The brownish-yellow seen beyond the coating is due to iodine resulting from the decomposition of the 
hydriodic acid during the operation of forming the coating. 
+ The names for the first three plates indicate the elements for which the coatings are characteristic, not the 
substances made use of in obtaining the coatings, as is the case for plate IV. 
