328 DR. JOHN S. FLETT: PETROGRAPHICAL NOTES ON THE PRODUCTS OF 
minerals than any of the others, and that augite is the predominant pyroxene. If 
we compare the analyses given below, it is clear that the 1903 dust is more like a 
hypersthene basalt in composition. The May dust of 1902 resembles a hypersthene 
andesite. Yet as the 1903 eruption was a small one compared with that of May, 
1902, it might have been expected that a larger proportion of the heavy particles 
would have subsided before the cloud reached Barbados. From this it seems clear 
that there was a slight change in the composition of the magma erupted by the 
Soufriere during the 12 months for which it had been in activity, and that the last 
emissions were more basic than the earlier. As Professor D’Albuquerque’s analysis 
is not stated in exactly the same way as Dr. Pollard’s, we give also the results of 
his examination of the dust of May 7 and 8, 1902, for comparison ; it shows the more 
acid character of the latter clearly. 
APPENDIX, 
r Bibliography 
Of the Principal Pools and Papers Relating to the Eruptions of 1902 and 1903 
in St. Vincent. 
The number of papers, of a popular and semi-scientific character, regarding the eruptions of 1902-1901, 
at Martinique and St. Vincent, which have appeared in newspapers and other periodicals is very great. 
Many of them were anonymous, and we have not thought it desirable to include in this list any which did 
not contain contributions likely to prove of lasting value. Descriptions of the volcanic phenomena in 
Martinique have been excluded. 
Anderson, Tempest, “Characteristics of Recent Volcanic Eruptions,” ‘Nature,’ vol. 67, p. 308 (1903). 
Anderson, Tempest, “Recent Volcanic Eruptions in the West Indies,” ‘Geog. Jour.,’ vol. 31, 
pp. 265-279 (1903). 
Bergeat, Alfred, “Ein Riickblick auf die vulkanischen Ereignisse in Westindien im Mai 1902,” 
‘Globus,’ Band 82, pp. 125-131 (1902). 
Bonney, T. G., “Notes on March Dust from the Soufriere,” ‘Nature,’ vol. 67, p. 584 (1903). 
Bridgford, John, “Analysis of Volcanic Dust from La Soufriere,” ‘Chem. News,’ vol. 87, pp. 223, 224 
(1903). 
Burns, David, “On the Phenomena accompanying the Volcanic Eruptions in the West Indies,” 
‘Report Brit. Ass., 73rd Meeting,’ pp. 567-568 (1904). 
Carmody, P., “Volcanic Eruptions : Reports on Analyses of Volcanic Dust,” ‘Bulletin of Miscellaneous 
Information,’ Trinidad, Botanical Department, No. 34, p. 450 (1902). 
‘Correspondence relating to the Volcanic Eruptions in St. Vincent and Martinique in May, 1902’ 
(Presented to both Houses of Parliament by Command of His Majesty, September, 1902). 
Curtis, George Carroll, “ Secondary Phenomena of the West Indian Volcanic Eruptions of 1902,” 
‘Jour. Geol.,’ vol. 11, pp. 199-215 (1903). 
Curtis, George Carroll, “Note on the West Indian Eruptions of 1902,” ‘Amer. Geol.,’ vol. 31, 
pp. 40-43 (1903). 
