PREFATORY NOTE 



THE first edition of the English translation of this text-book was 

 the work of Dr. H. 0. Porter, Assistant Instructor of Botany, 

 University of Pennsylvania. The proofs of this edition were 

 revised by Professor Seward, M.A., F.K.S. The second English 

 edition was based upon Dr. Porter's translation, which was revised 

 with the fifth German edition. The present edition has been 

 similarly revised throughout with the eighth German edition. 

 Such extensive changes, including the substitution of a completely 

 new section on Phanerogamia, have however been made in the 

 latter that it seemed advisable to give in outline the history of 

 the English translation instead of retaining Dr. Porter's name 

 on the title page. 



The official plants mentioned under the Natural Orders are 

 those of the British Pharmacoposia instead of those official in 

 Germany, Switzerland, and Austria, which are given in the 

 original. In making this alteration I have consulted Materia 

 Medica and Therapeutics, by J. Mitchell Bruce, M.A., LL.D., M.D. 



The fact that a considerable portion of the original has been 

 rewritten, has necessitated the preparation of a new and extended 

 index. I am indebted to my friend, Mr. F. Tidd Pratt, for 

 assistance in this. 



WILLIAM H. LANG. 



GLASGOW, February 1908. 



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