REPORT OF THE DIRECTOR I918 3I 



In the writing of a report on the discoloration of the pillars 

 of the Education Building, 73 quantitative determina- 

 tions were made, 5 4 of which were published in the report. 

 The interesting fact was discovered that the yellow 

 stain is due to sulphuric acid in the air causing the forma- 

 tion of gypsum stained with iron oxide on the marble. 



Analyses, pillar scale, marble and granite 73 



In writing with Prof. A. J. Moses an article on two 

 definite varieties of the rare mineral tungstite and 

 investigating the condition of the water therein, the 

 following quantitative determinations were made: 



Water 225 



WO3 12 



Specific gravity 6 



The following miscellaneous analyses were made at the 

 request of the State Geologist or the Assistant State 

 Geologist: 



I FuUers earth 6 



I Arsenopyrite 12 



I Magnetite 6 



I Pyxrotite i 



1 Vydte 6 



S Shales 27 



2 Graphites 14 



I Assay platinum i 



I Assay gold i 



I Water 5 



I Peat I 



On the various minerals and specimens brought in or 

 mailed in by members of the staff or people of the 

 State, the following work was done: 



Quantitative determinations 7 



Qualitative determinations 52 



Minerals determined by sight 93 



Total quantitative determinations 581 



Total qualitative determinations 52 



Total sight determinations 93 



Total 726 



