186 FLORIDA GEOLOGICAL SURVEY-13TH ANNUAL REPORT

 43. Subsoil of same. Depth not given.
 44. "Heavy gray hamniock" near Fort Meade (average of
2 samples). Depth O-20 inches.
 45. Subsoil of same. Depth 20-36 inches.

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

 46. Spruce pine scrub near Rockledge, Brevard Co. Average of 2 samples. Depth o-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 coquina hammock near Rockledge. Average of 2 samples. Depths 0-4 and o-6 inches.
 51. Subsoils of same. Depths 4-iS 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 having 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 I1%, 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