312 
DR. JOHN S. FLETT: PETROGRAPHICAL NOTES ON THE PRODUCTS OF 
Quartz. 9 • 00 
Felspars:—Orthoclase.5 • 00 
Albite.30 • 39 
Anorthite.32-15 
Pyroxenes.17-98 
Magnetite.4 * 41 
Ilmenite. 1'52 
Apatite.0‘34 
HoO.0-34 
I. 
II. 
III. 
IV. 
V. 
VI. 
SiO, 
56-71 
55-08 
55-64 
52-81 
57-62 
57-75 
TiO, 
0-77 
0-80 
0-98 
0-95 
0-87 
0-70 
ALOs 
18-80 
18-00 
18-21 
18-79 
19-76 
17-70 
Fe 2 0 3 
3-12 
2-46 
3-63 
3-28 
3-43 
2-84 
FeO 
5-35 
4-57 
4-83 
4-58 
3-90 
2-73 
MnO 
— 
0-21 
0-19 
0-28 
0-08 
— 
CoNiO 
— 
— 
— 
0-07 
— 
— 
MgO 
3-62 
3-34 
3-48 
5-19 
1-82 
3-51 
CaO 
8-06 
7-74 
8-10 
9-58 
6-25 
8-11 
BaO 
- r 
— 
0-03 
— 
— 
— 
NaoO 
3-65 
3-45 
3-55 
3-23 
3-79 
5-03 
K 2 0 
0-77 
0-65 
0-58 
0-60 
0-71 
0-94 
HoO 
0-11 
2-05 
0-74 
0-37 
0-90 
1-00 
HoO 
— 
— 
— 
— 
— 
— 
P 2 O 5 
0-08 
0-17 
0-11 
0-15 
0-17 
tr. 
S 
— 
— 
0-04 
— 
0-11 
— 
S0 3 
— 
0-24 
— 
0-33 
— 
— 
Fe 7 S 8 
— 
0-91 
— 
— 
— 
— 
Cl 
— 
— 
— 
0-14 
— 
— 
100-95 
99-67 
100-15 
100-35 
100-08 
100-31 
I. Vitreous bomb from the Soufriere (anal. Pisani, cited from Lacroix, ‘ Montagne Pelee,’ p. 598). 
II. Lapilli collected at Langley Park, St. Vincent (anal. Schmelck, ‘ Chem. Zeit.,’ XXVII., 1903, p. 34). 
III. Pumice from St. Vincent collected by Lieutenant Penny (anal. Steiger, 1 National Geog. Mag.,’ 
XIII., p. 291, 1902). 
IV. Dust that fell in Barbados May 8 th, 1902 (anal. Pollard, ‘ Quart. Jour. Geol. Soc.,’ LVIII., p. 368, 
1902). 
V. Dust that fell on the ship “ Coya,” 250 miles W.S.W. of St. Vincent (anal. Steiger, ‘ National 
Geog. Mag.,’ XIII., p. 291, 1902). (Contains also 0-29 S0 3 , 0 - 20 CaO, 0‘08 NaoO, soluble.) 
VI. Lapilli collected at Langley Park, St. Vincent (anal. Sciihelck, ‘Chem. Zeit.,’ XXVII., 1903, 
p. 34). 
Old Bombs. 
Among the materials washed down by the rivers on both sides of the island were 
many lapilli and small vesicular bombs, which closely resembled those of the recent 
eruption, but had a weathered appearance. On section these proved to be hyalopi- 
