1919. ] The Sixth Indian Science Congress. elxxiii 
very hers ele Se’ at least in its entirety, and proceeds to 
cite cases of exposures in the Salem district where outliers 
actual junction was found, fragments of Dharwar rocks were 
seen to be included in the Hosur gneiss. As Mr. Middlemiss 
observes (/.c., p. exevii) :— 
“With everything else in favour of the Dharwars being 
the younger formation, here is an appearance that I think . 
the majority of observers would say rors that the 
intrusive gneiss was younger than the Dharw 
And, after summing up the evidence to the pag Mr. 
Middlemiss writes (2 ¢., p. exevili) :— 
hus the evidence is conflicting. Whilst general con- 
clusions that have great weight are in favour of the 
younger age of the Dharwars, the particular section given 
above ones be held to prove just the contrary. 
, 1 think, by looking upon the Hosur gneiss as a 
rock that has passed through (it may be) several vicissi- 
tudes of solidification and plutonic re- melting without ever 
having developed much intrusive motion as regards the 
formations above, can the above conflicting testimony be 
rmonised.”’ 
ee 
With pes) to the igneous origin that Dr. Smeeth 
wishes to ascribe to the at, formation, Mr. Middlemiss 
observes (l.c., p. eaecil t 
“No graphic aE on of these extraordinary 
wholesale transformations of granites, quartz-porphyries 
and other igneous rock types, into schists, conglomerates, 
limestones and quartzites, has as yet appeared from the 
pencil of any of those responsible for the statements,”’ 
and decides to suspend judgment until such data are forth- 
coming. He then proceeds to cite data collected by himself, 
sedimentary origin for the crystalline limestones and cale- 
Spat complica ated in the latter case, according to Mr. 
Burton and myself, by lit par lit injection producing hybrid 
arta 
Finally, Mr. Middlemiss turns the tables on Dr. Smeeth 
with the following closing passage (l.c., p. ¢ pigs ine 
‘Consequently, it seems to me ag in dealing with 
any rock that appears to be abe doubtful spiel or mag- 
matic origin, it is above all necessary in these days to 
ascertain in wach direction the pian of change is moving. 
