1923. Reviews. 3g 



which dates back to 1436. The literature of the subject has been con- 

 sulted very fully, and authority is given for all quoted statements. In 

 addition, geological and niineralogical information is added a- required 

 ^o make the matters dealt with CviTiprehcnsiblc to the layman, and 

 references to the Ordnance Maps make it easy to locate places dealt with. 

 A short Introduction deals with the progress and knowledge of Irish 

 mines and minerals from early times to the present. 



A large map, excellently printed as regards detail, accompanies tlie 

 Memoir. On it the areas covered by bog, whether mountain or low-level, 

 arc coloured in pale red, giving a very marked character to tlie map. The 

 few coal areas are shaded black, and the various mines are shown by 

 bright red dots, follov.'cd by their name and an indication by chemical 

 signs of the nature of the minerals which they yield. All railways and 

 canals are also clearly shown. 



Now when the development of Irish industries is coming so much to 

 the fore, this Memoir and Map should be invaluable as indicating both 

 the possibilities and limitations of our mineral resources. 



R. LI. P. 



NOTES, 



BOTANY. 



A Hybrid Sedge new to Co. Dublin. 



Owing to the prevalence of the two sedges Carex flava and C. 

 Hornschuchiana in Glenasmole I have frequently looked for their hybrid, 

 known as C. xanthocarpa Degl., but unsuccessfully. In June, 1922, 

 however, I found a nice patch growing with both the parents in the meadow 

 between the steam-tram line and the S.E. corner of the lower Brittas 

 pond. When dried C. xanthocarpa is very like a starved specimen of 

 C. Hornschuchiana, but Miss Knowles, v.'ho has verified my specimen, 

 pointed out that the female spikelets are pointed in the former and blunt 

 in the latter. In the field, on the other hand, C. xanthocarpa had all 

 the appearance of a hybnd, rUfifering completely in its general colouring 

 from r. ITornschitchiana, and in its taller spikes and more distant spikelets 

 from C. tiaua. As in other hybrid sedges the fruits were all abortive : 

 one which looked to contain a mature seed wps found to shelter instead 

 a small insect larva . 



A. W. Stelfox. 

 Rathgar, Dublin. 



