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VERNON C. ALLISON 



centration then increases vertical growth. The only ones with 

 rapid drips are symmetrical stalactites Nos. 3 and 4, which show that 

 a rapid drip means a show vertical growth. The concentration of 



Fig. 7. — Symmetrical stalactites Nos. 2 and 3 and unsymmetrical stalactite No. 4 



Fig. 8. — Unsymmetrical stalactite No. 4 and synunetrical stalactites Nos. 4 and 5 



symmetrical stalactite No. 4 is greater than that of symmetrical 

 stalactite No. 3. 



The diameters of all the S3nnmetrical and the small diameters 

 of the unsymmetrical stalactites are about equal. Evaporation 



