24 Scientific Intelligence. 
orange-coloring matter, scarcely anything is known. It is not precipitated 
from these salts by means of alkalies. Of the purple-coloring matter, 
little is also known. It is formed at the same time as fuchsine, but in 
very small quantities, and from which it is difficult to separate perfectly. . 
Its properties are similar to those of fuchsine. It dissolves in concentrated 
—Kenie has investigated the chemical reactions which occur when wood 
is impregnated with a preservative solution of blue vitriol. He finds as 
a general rule, that a certain quantity of basic sulphate of copper remains 
combined in the pores of the wood in such a manner that it cannot be 
ose 
varieties of wood which contain the most resin retain the largest amount 
of the copper salt,—oak, for example, retaining but little of it. The 
ligneous fibre itself appears to have little or nothing to do with the fixa- 
ge ee 
being soluble in an excess of this solution just as the precipitate which 
forms when aqueous solutions of albumen and sulphate of copper 
mixed is soluble in excess of the latter. Since the nitrogenous matters — 
