S2-S.L 

 / ?5 2, 



TO 



WILLIAM JACKSON HOOKER, 



I, L. D. F. R. A. & L. S. 



Ri;uiL'.s riioiEssoR or cotaxy in the univeusity of ulasgovv, 



THIS SECOND EDITION IS INSCRIBED, 



BY THE AUTHOR, 



-^ A TESTIMONY OF GRATITUDE AND ESTEEM, 



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