differs from leuco-aurine, however, by yielding a purple 
solution on adding potassium ferricyanide to its alkaline 
solution, whilst leuco-aurine under the same conditions is 
oxidised to aurine, which dissolves in alkalis with a magenta 
red colour. 
By passing sulphur dioxide into a hot alcoholic solution 
of aurine, brick red crystals separate, being a compound of 
aurine with sulphur dioxide. They do not smell of sulphur 
dioxide, undergo no change when exposed to the air, and 
are only decomposed at a temperature above 100°, when 
they split up into sulphur dioxide and aurine. 
On mixing an alcoholic solution of aurine with a solution 
of a bisulphite of the alkaline metals, the liquid becomes 
colourless, a compound of aurine with the bisulphite being 
formed, which by spontaneous evaporation of the solution, 
is obtained in splendid, colourless, needles. These com- 
pounds are decomposed by acids as well as alkalis. We 
have not as yet analysed these different confounds, but 
intend to do so, hoping thus to find the correct formula 
for this remarkable compound. 
By heating aurine with alcoholic ammonia in closed 
vessels to 110°, the so-called red coralline is obtained, a 
body which has great resemblance to the yellow aurine, but 
dyes a redder shade. This compound we have also obtained 
in fine crystals. 
“ Species viewed Mathematically.” By T. S. Aldis, M. A. 
We have learnt that all energy is really one, whether 
seen in heat, constrained position or motion. Many also 
believe that life is really one, whether seen in man or a 
toadstool. But for our part we have often felt a difficulty. 
Why, if all life be one, do we not see it passing through 
every variety of form instead of being restricted to certain 
well defined types ? The present paper is an attempt to 
explain this. 
Let us consider what Plato might have called the 
