322 REPORT—1885. 
ir 
MANGANESE OXIDE. 
Intensity | Intensity 
Lecog de | = * ||  Leeoq de 
Boisbaudran if bade ee bey | Bs oisbandran ee ee 
(6327 | | meats 5549 2b," 
6288 2s | 5611 3b,” ' 
6249 3s 5473 5b , 
6234 4s B 5433 5s \hy 4 
n( 6215 4s 5427 5423 Sby [2° | 
6204 4br | 5395 8s 4 
6187 6185 4s 5398 5391 9b 
6178 4b¥ 5367 5359 9b* j 
6150 3s 5308 2b, 
5943 3n | 5260 4b," 
5932 2s | | 5223 5229 or 
3 5915 6n 4 5189 5192 OOS Btls 
5909 lb’ | 5155 5157 6b,” 
5887 7 5135 1b 
5858 6n 5089 3b” 
5847 2b¥ 
5807 1b,” / 
5759 2b," | 
5719 3b," | 
5688 3s 
5683 3s 5 
@) 5676 4b,v { Par” | 
5644 6b” 
5614 9b” 
5607 5bY 
5587 5580 on J ! 
Thirteenth Report of the Committee, consisting of Professors J. 
Prestwich, W. Boyp Dawkins, T. McK. Huaues, and T. G. 
Bonney, Dr. H. W. Crosskey (Secretary), Dr. DEANE, and Messrs. 
C. E. DE Rance, H. G. Forpuam, J. E. Ler, D. MACKINTOSH, 
W. PENGELLY, J. Puant, and R. H. Tippeman, appointed for 
the purpose of recording the position, height above the sea, 
lithological characters, size, and origin of the Erratic Blocks of — 
England, Wales, and Ireland, reporting other matters of interest 
connected with the same, and taking measures for their preser- 
vation. 
Tue Committee have to record the following additional observations. 
Continuing his previous investigations, Mr. Luff, of Clun (Shropshire) 
has traced fragments of the Upper Llandovery grit (which are scarcely 
large enough to be called ‘boulders’) along a bee line drawn across the 
map from Clun to Rhayader, twenty-three miles W.S.W. This line 
passed through Llanbister and Abbey-cwm-hir ; crossed at right angles 
the deep valleys of the Teme and the Ithon, and passed over the extensive 
Beguildy Mountains and the long transverse range of Cambo Hill. 
Fragments of grit were found at short intervals the whole of the way, 
