SYNOPSIS OP PARTS I, II, AND III. 
This synopsis is for the purpose of directing attention to the more 
important of the results of the work carried out on the Indian manga- 
nese-ore deposits, and for giving brief accounts of the more important 
theories. The results are summarized chapter by chapter : but it has 
not been considered necessary to summarize Part IV, in which are 
contained the descriptive accounts of the various deposits ; nor all 
the chapters in the other parts. For Part IV and the chapters not 
summarized, the lists of contents given at the beginning of this 
work are sufficient. 
[ Part I.] 
[INTRODUCTION AND MINERALOGY.] 
[CHAPTER II.] 
The effect of the presence of manganese on the colour of a mineral 
is considered, and attention drawn to the remarkable colour change 
that may be produced intr. a mineral by the presence in it of a small 
percentage of this element sometimes even of a trace. Whilst manganese 
minerals may exhibit almost any colour, the colours that seem to be 
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