Feb. igoi. Observations on Indiana Caves — Farrington. 261 



progressive molecular arrangement. The carbonate of lime was 

 deposited first in narrow, concentric bands. The substance then 

 rearranged itself in the form of more or less continuous fibres 

 arranged at right angles to the planes of deposition. Then with the 

 lapse of time and pressure a second rearrangement was made by 

 which the attractive forces brought the molecules together grouped 

 along rhombohedral planes. 



Fig. 6 — Broken end of stalagmite, showing change from fibrous to rhombohedral structure. 



Rate of Growth of Stagmalites. — I propose this word, com- 

 pounded from drdy/ua (drop) and MOos (stone), as a general name for 

 formations produced by dropping water. 



Under the present usage the expression stalactites and stalag- 

 mites, each term of which has a limited meaning, is the only one 

 available. So many stagmalites in this cave are in process of forma- 

 tion that it seems a favorable place for a study of their rate of growth 

 and of the variations which occur in this rate. In the hope of obtain- 



