﻿88 Canadian Record of Science. 



The ratio for EO : E2O2 : (SiTi)02 is 629 : 196 : 623, or, 



calculating the titanium as Ti.fi.^, 629 : 203 : 610 = 3 : 1 : 3. 



The analysis therefore accords well with the ordinary 



II III 

 garnet formula 3E0, E0O3, SSiO^ or EgE^SiaOig, and the 



mineral may be regarded as a titaniferous andradite, with 



a considerable proportion of the ferric oxide replaced by 



alumina. In composition it resembles somewhat the 



brown garnet from the Island of Stoko, analyzed by 



Lindstrom.^ 



By way of comparison the analysis of the Stoko garnet 



and also one of a garnet from the nepheline-syenite of the 



Island of Alno"^ are included in the following table. 



Stoko. 



Molec. R 



Alno. 



Molec. R. 



Dungannon.Molec.R. 



SiO^... 36-63 



610 610 



3115 



«•«! 603 



36-604 



610 623 



TiOo 





6-73 



1-078 



13 



Al.O^.. 9-97 



9«; 182 



3-14 



iil i«o 



9-771 



96) 196 



100 f 



Feo03..13-45 



23-83 



15-996 



FeO ... 2-28 



32^ 



.... 



• •■1 



3-852 



53^ 



MnO... -63 



9 1 



-58 



81 



1-301 



18 1 



CaO.. .35 90 

 MgO... -28 



^^l \ 698 



33-44 



597 } 616 



1 

 ... 1 



29-306 

 1-384 



^^ 



Na^O 





•68 



IIJ 



.... 



1 



Ign .... -16 



9j 







•285 



16J 



99-30 



99-55 



99-577 





A Lecture upon Acetylene.^ 



By Prof. J, M. Craft.s. 



A year and a -half ago, if a chemist had been told 

 that a new illuminating gas could be obtained from the 

 evil-smelling product with which he was only too well 

 acquainted in the laboratory, namely, the acetylene which 



1 Zeit. lur Kryst. u. Miii., xvi, 160, 1890. 



2 Sahlboin, in the paper by Hogboin already cited. 



3 Delivered before the Society of Arts at Boston, January 23, 1896. 



