Bull. U. S. B. F., 1931. (Bull. No. 3.) 
Figure 1. — Photograph of laboratory on the shore of Offatts Bayou near Galveston, showing a supply of shells in wire 
bags ready for planting 
Figure 2. — Photograph of pump and thermograph on end of pier adjoining laboratory. The thermograph bulb was at the 
edge of the channel under 2K feet of water at low tide 
