302 Scientifie Intelligence, 
United States it has already afforded Dadoxylon Halli from New 
York, and D. Newberryi from Ohio, besides the curious Ormoay- 
on Erianium. No doubt other species remain to be discovered, 
especially in the Upper and Middle Devonian. 
‘he writer of this note would willingly correspond with any 
one engaged in such researches, as he has now under examination 
a number of specimens from different parts of British America, and 
would be glad to have opportunities of comparison with those of 
the United States. J. W. DAWSON, 
ill College, Montreal. 
carbon in varying proportions. The coaly exterior is attributed, 
by Sir R. Christison, to bitumen passing to the surface as the de- 
structive distillation of the wood was going on within.—/7o¢ 
oy. Soc., Edinburgh, Jan., 1874. 
6. Volcanic History of Ireland ; by Prof. Epw. J. Hutt (Roy. 
Soc., Ireland, vol. iv, part I).—Professor Hull describes as of Lower 
? 
and Cavan. They are the representatives of the felstones and por 
phyries of North Wales, described by Sedgwick, Murchison am 
Ramsay, and those of Cumberland | 
_The Irish Upper Silurian contains igneous beds in the mount 
ainous region of West Mayo and Galway ; felstones, etc., along the 
western shores of Lough Mask; beds of ash, volcanic conglomer- 
ate and some of trap on the Promontory of Dingle, the thickness, 
according to Jukes, 2,500 feet, and interstratified with fossiliferous 
8. 
The Irish Devonian, in the Killarney Mountains south of Lough 
Guitane, where a bold rock, 1490 feet high, a mass. of columnar 
felstone, “indicates the position of an old ‘neck’ or voleanic throat, 
from either side of which, for considerable distances, beds of 
feldspathic ash and conglomerate, with large ‘balls’ of felstone, 
often hollow in the center, which were probably bombs shot out 
of the vent at various stages of the eruption.” Th 
ash re-occur at Lough Garagarry, Lough g 
Punchbowl, and rise into the summit of Crohane (2,162 feet) and 
the southern slopes of Killeen Mountain. To the south, there 
is another district containing cotemporaneous trap rocks at the 
