V, /7 



UNITED STATES GEOLOGICAL SURVEY 



J. W. I'OWELL, DIRECTOR 



THE F]X)R,A 



r>A_K:oT^ Guioui^ 



A POSTHUMOUS ^VORK 



LEO T.F.SQUEREUX 



EDITED BV I\ H. KNOWLTON 



WA.SH INGTON 



GOVERNMENT PRINTING OFFICE 

 1891 



