. Smithsonian miscellaneous collections. show that the amplitudes of the subhar-monics increase with latitude, so that in high latitudes in the neigh-borhood of the pole the subharmonics become vastly more importantthan the primary period. A study of the possibility of analyzing the data at each particularpart of the earth with the view to discovering fixed periodic cyclesindicates that if such cycles exist, the amplitudes are subject towide variations and even to inversion of phase from time to , when the complex cycles are analyzed individually andaverages taken for a small nmnbe
. Smithsonian miscellaneous collections. show that the amplitudes of the subhar-monics increase with latitude, so that in high latitudes in the neigh-borhood of the pole the subharmonics become vastly more importantthan the primary period. A study of the possibility of analyzing the data at each particularpart of the earth with the view to discovering fixed periodic cyclesindicates that if such cycles exist, the amplitudes are subject towide variations and even to inversion of phase from time to , when the complex cycles are analyzed individually andaverages taken for a small nmnber of successive cycles, it is possibleto project them into the future and combine and plot them in a curvewhich at times has a striking resemblance to observed data. As knowl-edge of methods and laws of change progress, this kind of fore-casting will undoubtedly be done with increasing accuracy. SMITHSONIAN MISCELLANEOUS COLLECTIONS VOLUME 82. NUMBER 8 FOUR NEW RACCOONS FROM THE KEYSOF SOUTHERN FLORIDA (With Five Plates) BY E. W. NELSON. (Publication 3066) CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION JULY 10, 1930 ZrU £orb (^atftmore (pnee BALTIMORE, MD., n. S. A. FOUR NEW RACCOONS FROM THE KEYS OFSOUTHERN FLORIDA By E. W. nelson(With Five Plates) Between the last of February and late in March, 1930, the authorvisited the keys lying about the southern end of Florida and collectedon them a series of -61 specimens of raccoons. The keys, or islands,visited proved to be segregated into four rather well-defined groupsand the specimens collected show very definitely that each group is oc-cupied by a subspecies of Procyon lotor peculiar to it, and all dififeringfrom Procyon lotor chiciis of the neighboring mainland. The main islands of each group are named below but, in addition,each group includes many smaller islets practically all of which arecovered with mangroves. 1st. Ten Thousand Islands Group forms a broad compact belt ofmangrove keys lying for about 100 miles
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