THE ERUPTIONS OF MAY, 1902, AT THE SOUFRIERE IN ST. VINCENT. 
331 
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DESCRIPTION OF PLATES. 
PLATE 26. 
Fig. 1. Norite, Wallibu, St. Vincent (polarised light, magnified 55 diameters). 
Shows a crystal of olivine surrounded by a corrosion border of hypersthene. 
Fig, 2. Hypersthene basalt, Calliaqua, St. Vincent (magnified 24 diameters). 
A hypersthene cluster full of spongy magnetite, the product of the resorption of olivine. 
Fig, 3. Quartz andesite, Soufriere, St. Vincent (magnified 47 diameters). 
Part of a large crystal of hornblende which is being replaced by hypersthene, biotite and felspar. The 
scaly biotite is very dark; the hypersthene and felspar are pale coloured. The hornblende (dark) occurs 
■only as islands surrounded by the other minerals. 
Fig. 4. Bomb (hypersthene andesite) of the May eruptions, 1902, Wallibu, St. Vincent 
(magnified 36 diameters). 
The photograph shows phenocrysts of augite, hypersthene, and plagioclase felspar in a vesicular, 
semi-vitreous groundmass. 
Fig. 5. Quartz andesite, Soufriere, St. Vincent (magnified 47 diameters; polarised light). 
Highly zoned phenocrysts of plagioclase felspar lie in a matrix full of small brightly polarising grains 
of quartz. 
Fig. 6. Hypersthene andesite, Soufriere, St. Vincent (magnified 24 diameters; polarised light). 
Below the centre of the photograph there is an idiomorphic cross-section of hypersthene so placed that 
it is extinguished; around it there is a narrow border composed of granular augite. 
2 u 2 
