probably of the Sulphur Group. 303 
bonate or oxalate of ammonia to this alkaline solution. 4. Dry 
chlorine passed over it at a dull red heat unites with it, forming 
a readily volatile chloride soluble in water. 5. Sulphuretted 
hydrogen passed through its hydrochloric solution precipitates 
it incompletely, unless only a trace of free acid is present ; but 
in an alkaline solution an immediate precipitation of a heavy 
black powder takes place. 6. Fused with carbonate of soda and 
nitre, it becomes soluble in water,—hydrochloric acid added in 
excess to this liquid producing a solution which answers to the 
above tests 2, 3, and 5. 
An examination of these reactions shows that there are very 
few elements which could by the remotest possibility be mis- 
taken for it. | 
The accompanying list includes every element, with the ex- 
ception of the gases, bromine, iodine, and carbon. Opposite the 
name of each I have placed the number of the reaction which 
eliminates it from the list of possible substances, taking great 
care, in every case, to give the benefit of any doubt which might 
arise, on account of an imperfectly known or doubtful reaction, 
in favour of the opposite opinion to that which I desire to prove, 
and, in cases where several reactions would prove the same thing, 
only making use of the most trustworthy. 
1, 5. Aluminium. 1. Iron. Selenium. 
Antimony. 1, 5. Lanthanium. 1, 5. Silicium. 
Arsenic. 1. Lead. 1. Silver. 
2, 3, 5. Barium. 2, 5. Lithium. 2, 5. Sodium. 
2, 3, 5. Beryllium. 2, 5. Magnesium. 2, 3, 5. Strontium. 
1, Bismuth. 1. Manganese. 5. Sulphur. 
1, 2, 5. Boron. 3, 6. Mercury. 1. Tantalum. 
6. Cadmium. 1. Molybdenum. Tellurium, 
2, 5. Cesium. 1. Nickel. 1, 5. Terbium. 
2, 3, 5. Calcium. 1. Niobium. 1, 5. Thorium. 
1, 5. Ceriwn. 1, Norium. A pb rei 
1, Chromium, Osmium. 1. Titanium. 
1. Cobalt. 1. Palladium. 1. Tungsten. 
1. Copper. 5. Phosphorus. 1. Uranium. 
1, 5. Didymium. 1. Platinum. 1. Vanadium, 
1, 5. Erbium. 2, 5. Potassium. 1, 5. Yttrium. 
1. Gold. 1, Rhodium. 2. Zine. 
1. Umenium. 1, Ruthenium. 1, 5. Zirconium. 
1. Indium. 
There are therefore left the following, amongst which, if already 
known, it must occur :—antimony, arsenic, osmium, selenium, 
and tellurium ; and although, to my own mind, many of the re- 
actions detailed above are sufficient proof that it cannot be one 
of the first three elements, yet I have thought it better to let 
them pass. 
Kach of the above five bodies, both in the elementary state 
and in combination, has been rigidly scrutinized in the spectrum 
