402 Journal of the Asiatic Society of Bengal. [November, 1912.] 
has also given us an account of the behaviour of the crystals 
under the microscope, and it is quite clear that the crystals of 
the two slags behave similarly. In this connection the follow- 
ing may be quoted :— 
‘Les secteurs opposés se colorent de la méme manicre, 
mais présentent une nuance différente de celle des deux autres. 
The specific gravity of the Kulti slag is 2°88; its hardness 
is rather variable, some portions can be scratched by the pen- 
knife, while sharp edges can also be obtained which leave faint 
impressions on glass. 
1 it., p. 290. 
2 The above conclusion is further corroborated by the chemical analy- 
sis of these two slags undertaken in the Chemical Laboratory of the 
i i rof, 
i 
haduri. The results of the two analyses are given below and along 
with them, for comparison, the analysis of the crystallized material des- 
cribed by Fouqué. 
If St. Nazaire 
37° 
Si 0., 37-76 38°06 60 
Fe20;, “O- 6°28 trace 
Al03, 13°28 11-10 12:26 
CaO, 41°31 40°63 40:11 
MgO, 4°50 2-98 9°33 
Alkali, 1°45 trace trace 


100-28 99°05 99°30 
