480 REVIEWS 



opening the preceding volume. A chapter is introduced by Dr. Smith 

 outlining the geological relations of the clays of the state. The sub- 

 ject is, however, incomplete, since the Tertiary and post-Tertiary clays 

 receive little specific consideration, and it is indicated that they have 

 not been studied in detail. 



The clays of Alabama are considered with reference to their physical 

 and chemical properties, and are discussed under the following head- 

 ings : China clays, which occur in six counties ; fire clays, which occur 

 in seven counties ; pottery or stoneware clays, which occur in ten coun- 

 ties ; and brick clays, which are mentioned in eight counties. This 

 latter class of clays must be far from complete, since the Tertiary and 

 Pleistocene clays appropriate for brickmaking must be very wide- 

 spread. 



In both these bulletins the educational intent is evident for, in 



both cases the authors appear to have had in mind readers who have 



no special knowledge of geology. The idea that geological reports 



should be written for those who are not familiar with the technicalities 



of the science is fortunately one which is gaining ground, as the recent 



publications of many state state surveys show. 



R. D. S. 



