PEEFACE vii 



R. A. Phillips; Dr. R. W. Scully, f.l.s.; A. Somerville, b.sc. ; and 

 Rev. C. H. Waddell, b.d., demand a particular acknowledgment. 

 Willing assistance was rendered by G. E. H. Barrett-Hamilton, 

 B.A., F.z.s. ; Rev. Canon C. F. D'Arcy ; Hon. R. E. Dillon, d.l. ; 

 Rev. W. W. Flemyng, m.a. ; G. Fogerty, m.d. ; W. A. Fogerty, m.d.; 

 J.Ernest Grubb ; Miss S. Grubb ; H. C. Hart, b.a., f.l.s. ; Rev. 

 Canon T. Hartley, m.a. ; Miss Isabel Home ; Prof. T. Johnson, 

 D.sc, F.L.S. ; Mrs. Frank Joyce ; W. F. de V. Kane, d.l., m.a. ; 

 Rev. Canon H. W. Lett, m.a. ; D. McArdle ; C. B. Moffat, b.a. ; 

 F. W. Moore, f.l.s. ; Joseph Neale ; W. F. Nicholson ; R. D. 

 O'Brien ; P. B. O'Kelly ; Mrs. D. D. Persse ; Miss Rosa Smith ; 

 S. A. Stewart, f.b.s.e. ; E. A. Stone ; Mrs. Allan Swan ; W. N. Tetley, 

 b.a. ; C. Waterfall; W. West, b.a. ; Prof. E. P. Wright, m.d., f.l.s. 



To Mr. W. P. Coyne, m.a., of the Department of Agriculture 

 and Technical Instruction, I am indebted for unpublished statistics 

 relating to agriculture and the present condition of the surface of 

 the country ; and to Prof. Grenville Cole, f.g.s., m.e.i.a., and to 

 Mr. H. J. Seymour, f.g.s. of H. M. Geological Survey, for sug- 

 gestions and assistance in the preparation of a petrographical map 

 of Ireland. For welcome aid rendered in the later stages of the 

 work, I desire to thank Miss Constance Adams ; Mr. R. A. 

 Phillips ; and Miss Christiana Vance, b.a. 



Thanks are also due to many English correspondents, who 

 rendered special service in the unravelling of critical genera. Mr. 

 Arthur Bennett, f.l.s., passed through his hands many hundreds 

 of specimens of Pondweeds, Sedges and miscellanea, collected 

 in all parts of Ireland. Messrs. H. and J. Groves, f.l.s. ; Mr. 

 F. J. Hanbury, f.l.s. ; Rev. E. F. Linton, m.a., f.l.s. ; Rev. 

 E. S. Marshall, m.a., f.l.s. ; Rev. W. M. Rogers, m.a., f.l.s. ; 

 and Mr. Frederick Townsend, m.a., f.l.s., freely lent their aid 

 in other critical groups. My thanks are tendered also to the 

 Royal Irish Academy for a generous grant towards the expenses of 

 the last year's field-work. 



