4,2 6 Dr. Pearson's Observations 
6. Manganese would have been seen on concentrating by 
evaporation the nitrate solution, § 5. (c) ( d ). 
7. Arsenic would have manifested itself by the brittleness 
and whiteness of the metals ; by the smell and visible vapour 
on exposure to fire and air ; and on examining the solution, 
§ 5. ( d ), and the white deposit, § 5. (e). 
8. Antimony would have produced more brittleness than 
these ancient metals possessed : a white vapour would have 
appeared on examining the white sediment with the blow- 
pip e , § 5. ( e ): as well as in the experiments in the assay fur- 
nace, § 4. ( b ) ( e ) ; and a white precipitate would have fallen 
on diluting the muriatic solution of the white deposit from the 
nitrate solution, § 5. ( e ). 
9. Cobalt would have been detected by the prussiate of soda ; 
and by the colour of the oxide, in the experiment in the as- 
say furnace, § 4. [b ) ; and it would have given brittleness to 
the ancient metal instruments. 
10. It is not at all probable that nickel was present ; but if 
it had been an ingredient, it most likely would have been be- 
trayed by its greenish oxide in the experiment, § 4. (6). 
11. Molybdcena , and quicksilver may be mentioned for the 
sake of order, but it is utterly unreasonable to suppose them to 
be present, either naturally or by art ; and evident appear- 
ances, or at least traces of them, must have occurred in the pre- 
ceding experiments. As for the substances called tungsten , 
uranite, menackanite, and titanite * we have not yet had suffi- 
cient evidence to prove their being peculiar metals ; but from 
the properties which have been observed to belong to them, it 
is quite inconsistent with the preceding experiments and obser - 
* A new metal, named Titanium, lately announced in the German Journals. 
