ACKNOWLEDGMENTS 



Illustrations. Figures 1-23, 25-28, 37-39, 59, 66, 67, 74, 75, 83-85, 98, 99, 106, 

 107, 112, 128, 130, 140, 144, 148, 150, 163, 164, 171, 174, 197, 199, 200-202, 204, 

 207, 208, 212, 221, 238, 244-248, 252, 254, 255, 259, 265, 284, 285, 289-293, 295- 

 302 are reproduced by arrangement with Messrs Macmillan & Co., Ltd. ; Figs. 

 307, 308 by permission of the Royal Society, Edinburgh ; Figs. 76-79, 8t, 82, 91, 

 97, 114, 127, 134, 135, 141, 142, 149, 151, 161, 173, 175, 176, 178, 180-182 by per- 

 mission from the Proceedings and Transactiotis of the Royal Society, Edinburgh ; 

 Figs. 35, 40, 41, 43, 44, 49, 51, 52, 54 are reproduced from fi. Christ's Geographie 

 der Fame, by arrangement with Herr Gustav Fischer; Figs. 24, 129 from G. F. 

 Atkinson's The Biology of Ferns; Figs. 33, 34, 50, 53, 56, 66, 74, 75, 93, 94, 189, 

 195, 196, 236 by arrangement with Herr Wilhelm Engelmann. Numerous Figures 

 by the author himself and by other Botanists have been drawn from the Annals 

 of Botany, for the use of which due acknowledgment is made to the Clarendon 

 Press, Oxford. 



