REVIEWS. 1338 
shown by recorded observation Mayon is a composite cone. In 
fact, according to Abella,? it is more nearly a lava dome, and, 
since Abella probably had the best opportunities for observation, 
- it might be stated that the weight of evidence points toward its 
being a lava dome. 
These errors in regard to the only examples with which the 
author of this criticism is personally familiar would tend to 
discredit all of the examples cited in this voluminous publica- 
tion. They show at least that the preparation had been done 
in a most careless manner, a condition especially to be deplored 
since the book is intended to be a textbook for students and 
especially adapted for university work. 
Appendix B might be criticized as being too general. The 
definition of granite and syenite as being sometimes porphyritic 
differs from the classification of such well-known authorities as 
Kemp, Iddings, Cross, Pirsson, Washington, and Hateh who 
make a definite and distinct differentiation between granite and 
granite-porphyry. 
14 40h JB 
*This Journal, Sec. A (1911), 6, 464. *Tbid., p. 467. 
