542 Scientific Proceedings, Royal Dublin Society. 
of very minute hydrated crystals which had grown upon nuclei of 
the amorphous sulphate. It was not determined whether these 
crystals were of the same composition as the normal salt or not, 
‘but it may be remarked that very similar groups were precipitated 
from a saturated solution of the normal salt by the addition of 
alcohol. 
Why the saturated solution of the fully hydrated salt 
CuSO,5H,0 did not admit of the anhydrous cupric sulphate 
becoming hydrated except to a very limited extent, or, which is 
the same thing, very slowly, is to be explained by its inability to 
take into solution any more of the salt which is formed by the 
combination of the anhydrous compound with water (June 
19th, 1901). 
