THIRD ANNUAL REPORT. PL. 20.

CALCAREOUS STREAMS.

Fig. I.-Looking up Wakulla River from upper bridge a few miles below Wakulla Spring (Wakulla County), showing Taxodium distichum (cypress), Tillandsia usneoides (moss), Sagittaria lancifolia, etc. April 9, I9Io.

Fig. 2.-Head of Homosassa River, looking downstream from railroad trestle about a mile northeast of Homosassa (Citrus County). May 23, 1909.

FLORIDA GEOLOGICAL SURVEY.