GEOGRAPHY OF CENTRAL FLORIDA 81

used with caution. The principal use made of them here is to determine the relative importance. of dif ferent crops in 1913-14 and 1917-1918. Besides returning the crops in more detail, and giving not only acreage but values by counties, another advantage of the state census is that its crop year runs from July I to June 30, on account of Florida's most valuable crops being harvested in winter and spring, while the government census naturally returns the crops by calendar years in Florida, for the sake of uniformity with other states, all of which have colder winters and mostly summer crops.
 On account of the appropriation for the Geological Survey remaining at the same number of dollars per annum that it was when money was worth twice as much as it is now, rigid economy has had to be exercised in the selection of illustrations. Out of several hundred photographs available for the purpose, .the choice has been narrowed down to 25 new half-tones and 14 old ones. This leaves without illustration such interesting physiographic features as the supposed highest hill in the state (in Polk County), the limestone caves of Marion County, the noted natural race-course of Daytona Beach, salamander hills, and several beautiful lakes and rivers; such vegetation types as grassy dunes, peat prairies and several other types of prairie, the characteristic low hammocks of the Gulf hammock and lake regions, the short-leaf pine and hickory woods of north-central Marion County, calcareous swamps of various kinds, and the flatwoods, bays, and lake shore vegetation of the lake region; and such artificial features as phosphate mines (both hard rock and pebble), the "diatomaceous earth" plants of Lake County, clay pits, sawmills, turpentine stills, roads of crushed limestone, brick, shells, or pine-straw, stone walls, rock chimneys, cattle ranches, orange groves, sugar-cane fields, truck farms, types of farm-houses, cities, towns, hotels, etc. And the counties of Sumter and Hillsborough do not happen to be represented at all in the illustrations, although many pictures have been taken in both. But some of these features or places are well illustrated in previous publications of this Survey, or in easily accessible magazines and pamphlets.
 Figures 3, 7, 9, 11-1-3, 20-22, 29, 35, 36, 39 and 41 are from earlier reports, and the remaining 25'are new. All are made from photographss in the writer's private collection of American zeovraphical views, except three that are otherwise credited. They