vin PREFACE 



permitted, to put the reader in possession of the evidence 

 as a whole. This applies especially to the question of 

 alternation of generations, as to the nature of which 

 such different views are held. 



As regards the fundamental homologies between 

 Cryptogams and Phanerogams, an attempt has been 

 made to demonstrate, and not merely to state them. 

 Unless the student be taught to follow the reasoning by 

 which such conclusions are arrived at, morphology loses 

 at once its interest and its educational value. 



It may be well to state again explicitly that the use 

 of this book requires to be accompanied from the first 

 commencement onwards (1) by the study of living plants 

 in the field, without which all botanical teaching is dull 

 and barren ; and (2) by practical work in the laboratory. 



The author is indebted to the Trustees of the British 

 Museum for permission to make use of the cuts, re- 

 produced in Figs. 110114, from Mr. Arthur Lister's 

 Monograph of the Mycetozoa. As in Part L, the 

 figures signed E. S. have been drawn from nature by 

 Mrs. D. H. Scott. Figs. 5 and 44 are the work of Mr. 

 W. C. Worsdell. The source of all figures not original 

 is acknowledged in the descriptions. Special thanks 

 are due to Professor J. Bretland Farmer for his kind help 

 in connection with the Liverworts and the Fucacese. 



D. H. SCOTT. 

 October 12, 1896. 



