1822.] Mr. Children on Diaspore. 147 
the manner used by Berzelius in his excellent analysis of Wavel- 
lite. I also made a separate experiment to ascertain if the 
diaspore contain an alkali, by fusing it with nitrate. of baryta, 
but of this also I could discover no trace. The result of my 
analysis conducted as above gave 
SPIE ere heres 2 eos no sak ce nee 76°06 
Protexideotiron }.... |. 3... Mare aires yr 
Water: saeeteccsresseere rece 14:70 
EI OR Pd pale Ta ia ie. i aaa ig? 4 
100-00 
Perhaps the true proportions may be : 
Equivalents. 
ATOM 63... UE. 76:923 = 20 = 360 
Protoxide of iron. .... 7°692 = 1= 36 
(fe 2 15:385 = s= vB) 
100-000 468 
Lelievre’s diaspore is accompanied by a dark coloured sub- 
stance, which has been supposed to be a mere variety of the 
lighter, but by the following experiment, on a minute portion 
furnished by Mr. Sowerby, before the blowpipe, that does not 
appear to be the case. 
In the matrass, if freed from the true diaspore, the assay does 
not decrepitate. Its dark brown (almost black) colour becomes 
rather lighter, and it gives off a large quantity of water. Alone 
in the forceps it does not fuse. The heated fragment does not 
brown moistened turmeric paper. 
With soda, on platina wire, in the oxidating flame, it gives a 
light opaque dirty brown globule. In the reducing flame, the 
colour is darker, and somewhat inclining to bottle-green. 
On platina foil, with soda and nitre, it gives no trace of man- 
nese. 
With borax, on platina wire, in the oxidating flame, fuses 
slowly into a perfectly transparent glass, deep orange-red while 
hot, fine yellow when cold, and which does not become opaque 
by flaming. In the reducing flame, the colour of the globule 
changes to bottle-green. 
With salt of phosphorus, on the platina wire, in the oxidating 
flame, it dissolves slowly, but perfectly, into a diaphanous glass 
of a fine deep orange colour while hot, which, on cooling, 
becomes lemon-yellow, and when quite cold is colourless. In 
the reducing flame the assay presents the same phenomena. 
A portion of the pulverised assay treated with a drop of nitrate 
of cobalt on charcoal, in the usual manner, gaye a black 
mass. 
» Vauquelin’s analysis of Lelievre’s diaspore gave 
L < 
