422 Neientific Intelligence. 
the Wicklow above 100,000/. The largest known nuggets were 3ib. 
from Lanarkshire, and others of 24 |b. from there and Wicklow. The 
importance of attending to this branch of the national resources was 
strongly urged. Mr. Calvert concluded by stating that he considered 
the cla ay-slate formations of Canada would soon be discovered to be a 
vast gold-fie : 
36. Reports of Professor Henry D. Rogers, on Wheatley Brookdale 
and Dhariccion ey Phenizville, Chester Co., Pennsylvania. 
8vo.——The lead-veins of Phenixville are very singularly productive in in 
fine Sr aiailien aoe of the ores of lead, and according to the report of 
Prof. Rogers, they appear to promise well in an economical point of 
view. ‘The specimens of the sulphate, ee molybdate, and phos- 
phate of lead are of remarkable beauty. 
The veins have a new parallelism, ranging with few exceptions, 
about N, 32°-35° E. by compass. They inte rsect a gneiss roc 
some of them also cut {one an overlying red shale which Prof. Rogers 
states is probably of the triassic age, or perhaps of the older oolitic. 
hey are therefore subsequent in wo Bi tothe shale. Numerons trap 
dykes also intersect the same red shale Fibs in this region as we 
as in the Connecticut valley. The lodes confined to the gneiss in 
general bear lead as their principal ae a those which intersect, 
also the shale contain ores of copper. Zinc ores (blende and calamine 
prevail in both sets of veins, but somewhat more abundantly in the lat- 
Ill. Botany. 
1. Harvey: Nereis Boreali-Americana; or Contributions to a His- 
tory of the Marine Alge of North America. Part IL. Rhodospermee. 
March, 1853. pp. 258, 4to. Plates 13-30; colored. Separate issue, 
from the fifth volume of the Smithsonian Contributions to Knowledge 
——Our extended notice of the first part, published a year ago, sulfi- 
ciently explains the nature and scope of this elaborate work. The 
present part contains a full systematic account of our North American 
Rhodospermee, the rose-colored Alge, which are much more numer- 
ous than the Melanospermee, or olive-green Alge, as well as more 
difficult to discriminate. Over a hundred pages more of letter-press 
and twice as many plates are therefore devoted to their elucidation ;— 
a liberal allowance, under the al a Sate but twice as many 
cate texture of t wodospermee render them ‘charming objects for 
such isons) ‘instenees and Dr. Harvey’s pencil is unrivalled in th 
depa ut it is next to impossible to find colors so bright and 
iug, in all their species, two kinds of fructification, or rather two kinds 
of spores, borne always on different eine and each eqvat lly cap- 
oe: of germinating and reproducing the species. The idea of each 
pecies, therefore, includes two individuals, not however as in cert 
