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CONTENTS, —Vol I. The Pretertiary Insects (with 35 plates). Vol. II, The Tertiary Insects (with 28 
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THE M HYPOTHESIS. By J. Norman Lockyer, F.R.S., Correspondent of the nane 
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THE rd hee Soe OF TRR. RAVEN (Corvus corax sineratus). A Guide to Ka -n ot the Mus- 
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