SUMMARY OP THE CONTENTS. 463 



garni a preserve their power of germination even after being ex- 

 posed to the highest temperatures .... 255 257 



Diminution, if not entire suspension, of organic functions in the 

 winter sleep of animals belonging to the higher classes. . 257 



Summer sleep of animals in the tropical zone; great dryness acts 

 like winter cold. Tenrecs, crocodiles, tortoises, and the Lepidosiren 

 of Eastern Africa , , . :- . . . . . 257259 



Anther dust or pollen: fertilization of flowers. The Coelebogyne 

 found to produce perfect seeds in England, without any traces of 

 pollen being discovered . . . ."'-.'. . 259 260 



The luminosity of the ocean produced by living luminous animals and 

 by decaying fibres and membranes of animals. Acalephse and 

 silicious-shelled luminous Infusoria. Influence on the luminosity 

 of a stimulus applied to the nerves .... 261 266 



Pentastomes inhabiting the pulmonary cells of the rattle-snake of 

 Cumana **&&* -^- V ;*,, v ;- . . . 266267 



Rock-building corals. The scaffolding or solid material which survives 

 the death of the coral animals. More correct views of recent times. 

 Shore reefs, encircling reefs, and lagoon islands. Atolls, or coral 

 walls enclosing a lagoon. The coral islands to the south of Cuba, the 

 Jardines del Rey of Columbus. The living gelatinous investment 

 of the calcareous scaffolding of the coral trunks attracts fish and 

 turtles in search of food. Singular mode of fishing by the aid of 

 the Remora (the Echeneis naucrates) . . - . . 267 274 



Probable greatest depth of coral structures . . . 274 276 



Besides much carbonate of lime and magnesia. Madrepores and 

 Astraeas also contain some fluoric and phosphoric acids 276 277 



Oscillatorv state of the bottom of the sea according to Darwin 



277278 



Traditions of Sainothrace. Irruptions of the sea. Mediterranean 

 Sluice theory of Strato. Myth of Lyktonia, and the " Atlantis 

 broken into fragments" . . . . . 278 281 



On the -causes which prevent the sinking down of clouds and precipi- 

 tation taking place from them . . . . . 281 282 



Heat disengaged from the crust of the earth while solidifying. Hot 

 currents of air which in the early ages of the earth, from frequent 

 corrugations of the strata and elevations of land, may have been 

 diffused in the atmosphere from temporary fissures . 282 283 



