738 Scientific Proceedings, Royal Dublin Society. 
an analysis of the yellow earth as originally found, but freed from 
the larger parts. The following was the results reported by him, 
showing the presence of the TiO, in notable quantities in the fine 
part of the clay and to a certain extent accounting for the 
colour of it :— 
Percentage. 
He MUR TLaan yt WORE Lea een TAN Gola WZ 
Fe20s, 5 5 o 5 3 O 5 6°75 
FeO, . i : . ” 7 x , — 
Al,03, 5 ‘ ° . ° . fs 35°45 
CaO, . ‘ ‘ : 5 ‘ Z 0°65 ~ 
MgO, . 6 : c 2 : : 5 0-99 
Na,20, 5 = 5 . ° = 5 e 0:10 
TiO2, ° . . . ° . : . 6°22 
Combined H20, . ‘ Bi F 6 : 5°46 
100:02 
A sample of the same clay was also submitted to Mr. H. 
Ramage, assistant chemist in the Royal College of Science, 
Dublin, for examination by the spectrographic method so re- 
markably applied by him in collaboration with Professor W. H. 
Hartley, F.R.S., to the determination of the presence of 
certain of the rare elements in minerals and ores, as detailed 
in their Paper published by the Chemical Society (see Transactions, 
1897, p. 583; and Proceedings, Royal Society, 1896, 60, p. 35; 
1897, 60, p. 393). 
Mr. Ramage’s results were as follows :— 
In the precipitate containing the iron alumina, &c., were found 
iron aluminium ; copper ; nickel; silver ; gallium ; calcium ; lead ; 
chromium ; (traces of); sodium; and potassium. In the residue 
containing the alkalies, were found—sodium ; potassium ; rubidium ; 
caesium ; lithium; calcium ; strontium ; copper ; iron (traces of) ; 
manganese.’ 
Along with the anatase minerals occurred small crystals of 
brookite (Pl. XXV., fig. 1), presenting the usual characteristics of 
that mineral, and forming light-brown plates, striated, and of a 
sub-metallic lustre ; in some cases showing sufficiently well-defined 
crystalline forms to allow of these being determined ; moreover, 
1 Silica and titanic acid were not looked for, but only those bases present in small 
quantities. By the ordinary method of analysis, gallium as sesquioxide would be 
precipitated along with the alumina. 
