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 

 FossiHbitds, rarity of, 86 

 Fossil man, 13 



Fossilization a slow process, 10 

 Fossils, conditions under which they are formed, 5, 7 



coUecting, 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 ice-floes, 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 



