+ 
306 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1944 
that are as yet undiscovered. If we now set ourselves to the task . 
all over the earth as effectively as we have already done in our coun- 
try we should be able to establish tremendous additional reserves. At 
any rate, if our total petroleum resources are as limited as we fear they 
may be, the explanation does not lie in any original lack of organic 
source material in the sedimentary rocks of the earth’s crust. A very 
small fraction of the organic matter originally present in the most 
promising rocks would have sufficed as raw material for a great deal 
more petroleum than we have as yet discovered. 
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