; 
F 
; 
INDEX 247 
Flightless birds, absent from Tasmania, 155 
present distribution, 154, 155 
relation between flightlessness and size, 156 
Folds and frills, 129 
Footprints, collections of, 47 
books on, 47 
See also under Tracks 
Fossil birds, rarity of, 86 
Fossil man, 13 
Fossilization a slow process, 10 
Fossils, conditions under which they are formed, 5, 7 
collecting, 112-116 
definition of, 1 
deformation of, 16 
impressions, 2, 3 
not necessarily petrifactions, 2 
preparation of, 117-119 
why they are not more common, 5, 15, 16 
Fowls, muscles of, 81 
Frill of Triceratops, 102 
Fur-seals killed by oe 233 
Gar pikes, destruction of, 26 
Giant birds, reasons for distribution and flightlessness, 
153 
Giant Moa, 141 
leg compared with that of horse, 152* 
Giant Sloth, domesticated by man, 224 
struggle between, 46 
