l86 FLORIDA GEOLOGICAL SURVEY I3TH ANNUAL REPORT 



43. Subsoil of same. Depth not given. _ 



44. "Heavy gray hammock" near Fort Meade, (average of 

 2 samples). Depth 0-20 inches. 



45. Subsoil of same. Depth 20-36 inches. 



East Coast Strip. (All frojn Bull. 13.) 



46. Spruce pine scrub near Rockledge, Brevard Co. Average 

 of 2 samples. Depth 0-6 inches. 



47. Subsoil of one of these. Depth 6-36 inches. 



48. Heavy gray hammock near Rockledge. Average of 2 

 samples. Depth 0-18 inches. 



49. Subsoil of same. Depth 18-36 inches. 



50. Red cocjuina hammock near Rockledge. Average of 2 

 samples. Depths 0-4 and 0-6 inches. 



51. Subsoils of same. Depths 4-18 and 6-36 inches. 



Comments on the Mechanical Analyses 



The significance of the relative proportion of the different 

 sizes of sand grains does not seem to have been determined, except 

 in a very general way; but other things being equal, the soils hav- 

 ing the largest proportion of silt and clay generally have the most 

 available plant food and support the most luxuriant (or fastest 

 growing) vegetation, with the largest proportion of deciduous 

 trees. The clayey low hammocks of the Gulf hammock region 

 (analyses i to 3) and lake region (34, 35) lead in this respect, 

 the former having over 50% of silt and clay, and the latter over 

 25% in the soil and 65% in the subsoil, probably chiefly in the 

 form of marl. Some of the calcareous high hammocks of Marion 

 County also stand high in this respect. The white sand or scrub 

 of the lake region and east coast has the least clay, only about 1%, 

 and is the poorest soil in the list, its vegetation being nearly all 

 evergreen. The moisture capacity and organic matter (given in 

 Bulletin 13, but not in the soil surveys) are seen to be highest in the 

 best soils, at least as far as the determinations go. 



CHEMICAL ANALYSES ' 



No entirely satisfactory chemical analyses of the soils of our 

 area are available, but some of varying degrees of accuracy and 



