THE GROWTH OF STALAGMITES AND STALACTITES iii 



TABLE I 



Rate of Growth of Experimental mine Stalactites 



EFFECT OF THE VARIOUS FACTORS AFFECTING THEIR GROWTH 



These stalactites are shown as follows : unsymmetrical stalactite 

 No. I, Figure i, enlarged about 6 diameters, Figure 2; symmetrical 

 stalactite No. i, Figure 3; unsymmetrical stalactite No. 2, Figure 4, 

 enlarged about 6 diameters, Figure 5; unsymmetrical stalactite 



Fig. 6. — Unsymmetrical stalactite No. 3 



No. 3, Figure 6; unsymmetrical stalactite No. 4 and symmetrical 

 stalactite Nos. 2, 3, 4, and 5, Figures 7 and 8, unsymmetrical 

 stalactite No. 2 grew on green concrete, all the others on concrete 

 from three to eleven years old. Carbonic-acid charged water 

 evidently abstracts lime more easily from young concrete. Con- 



