PETROLOGICAL ABSTRACTS AND REVIEWS 283 



the "wave surface," and this again is confusing to students. The 

 vibration "ellipsoid" of Fig. 131 should of course be "ovaloid." 



P. 243, line I, second paragraph, for "microscope" read "microm- 

 eter." 



P. 275, next to last line, for figure "370" read "373." 



P. 358, a and a should read B and B' (lines 3 and 11). 



P. 359, line 2, sin 'V>K should read sin ^V<K. 



P. 528, in table, fifth column, bottom row " bromof oriti " should read 

 "iodoform." 



It is remarkable, considering recent tendencies, to find so large a 



general treatise in petrography without an abundance of newly coined 



terms. The author contents himself with one: melatope, for the spot 



or "eye" in interference figures representing the emergence of an optic 



axis. 



George D. Louderback 



Johnston, John, and Adams L. H. ''On the Density of Solid 

 Substances with Especial Reference to Permanent Changes 

 Produced by High Pressures," Jour. Amer. Chem. Soc, XXXIV 

 (191 2), 563-84. 



Johnston, John, and Adams, L. H. "On the Effect of High 

 Pressures on the Physical and Chemical Behavior of Solids," 

 Amer. Jour. Sci., XXV (1913), 205-53. 



Kato, Takeo. "Ueber die Kordieritfiihrenden Einschliisse in der 



Lava aus dem Vulkan Komagatake auf Hokkaido, Japan," 



Jour. Geol. Soc. Tokyo, XIX (191 2), 27-37. 



The volcano of Komagatake is built up of layers of pyroxene andesite 



and pumice agglomerate. The chief lava streams are three in number, 



of which the lower is compact, the second less so, and the upper porous 



and slaggy and filled with inclusions of the same material and fragments 



of rhyolite, norite, and cordierite-bearing rock. The three lava streams 



have similar mineral composition and consist of labradorite, hypersthene, 



and augite, in a glassy or hyalopilitic groundmass. Olivine occurs in the 



lower part of the middle flow. The underlying rock of Komagatake 



consists of late Tertiary tuffites, shales, and diatomaceous earths, and 



the cordierite in the included fragments has been produced by the 



metamorphism of the sedimentary rock by the andesite. 



A. J. 



