Explanation of Pl. XXXII. 



Fig. i. Section of stalagmite from 

 Robertson Cave, Missouri, 

 showing changes in direc- 

 tion of growth. 

 (Mus. No. G 604.) 



Fig. 2. Cone-shaped stalagmite, 

 Marengo Cave. 

 (Mus. No. G 1022,) 



