February 20, 1891.] 



SCIENCE. 



1 1 1 



Roofs, etc.," by S. Anglin; "An Introduction to the Study of 

 Metallurgy," by C. Roberts Austen, C.B., F.R.S.; "Chambers's 

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 " Aids in Practical Geology," by G. A. J. Cole, F.G S. ; "Historic 

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 after nature). 



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