In accordance with Lorie and Prof. Behrens we have determined all collected samples as real basalts. The microscopic praeparates only show difference in relative number and size of the separated crystalls between them, and with respect to the groundmass, also in his capacity of the groundmass itself. As conson with basalt, the olivine exclusively appears as porphyric separation and not in the g…
The literature on the Lamongan is less extended than that on the Tengger. The already previously (p.7) referred treatise of van Herwerden and the great work of Junghuhn are up to now the only sources for the knowledge of this remarkable mountain.
The lamongan is not by destroying catastrophes, such as in Tambora and Krakatau.