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Will it not illustrate loss of fossils to consider whether there are crocodiles, marsupials &c &c in formations intermediate between where first found & present day — showing by Conchology how many species probably have died out.—

Scientific Practice: theoretical statement; speculation; reasoning from theory
Physical Characteristics: wove paper; off-white
Textual Features: base text pencil

Transcription and apparatus copyright the American Museum of Natural History