246 FLORIDA GEOLOGICAL SURVEY-I5TH ANNUAL REPORT

the Southern States, where a more favorable climate and lower living costs prevail.
 Parts of Florida have become widely known as winter resorts. This is particularly true of the Atlantic coast, the southern two-thirds of the peninsula, and the Gulf coast. This has given rise in the tourist centers to a development peculiarly adapted to the needs of winter visitors, and has called for an extraordinary amount of building in this part of the State.
 In 1921, there were 5,312 miles of railway within the State, which amply serves the regions already developed, and in which development will continue for some time. Water transportation is also highly developed and is carried on inland by rivers, lakes and canals. Interstate and foreign marine commerce is an item of considerable magnitude, which is handled through three chief ports (Jacksonville, Tampa, and Pensacola) and numerous smaller ones.

 SOURCES OF STRUCTURAL MATERIALS
 Within the last half-century the production of common brick and tile in Florida has not supplied the demand for these materials. Georgia and Alabama producers have been called on to supply the shortage, which has resulted in Florida becoming one of the principal markets for the products from these states. The excessive increase in freight rates, in addition to the enormous development in south Florida, has, within the last decade, caused an earnest inquiry into the possibilities of developing a local supply of structural materials adequate to meet this growing demand or for finding satisfactory substitutes.
 The three producers in the extreme western portion of the State (Escambia County) have, on the other hand, marketed much of their output in neighboring states, even supplying wants as far away as New Orleans. It is to be noted, however, that the shipping distance by rail from Pensacola to South Florida is greater than from the Piedmont section of Georgia, thus making it cheaper to use Georgia products than those from West Florida. Shipment by water from Pensacola would mean hauling the brick several additional times, thus making it little, if any, cheaper than rail transportation. It is most expedient, therefore, for Georgia brick to be used in peninsular Florida, when local supplies are inadequate or of unsuitable quality, in preference to