INDEX 



417 



France, cultivation of purple variety 

 of poppy in, 364 



French archaeologists, leading dis- 

 coveries with regard to pre- 

 historic man made by, 371, 



Frogs, common, eggs of, 209, 212 

 growth from the egg, 213-215 

 English species, 216 

 European species, 216, 219 

 green tree-frog of Riviera, 49, 50, 



52, 55 



method of catching prey, 219 

 Furniture worm, 351, 352 



Gases- 

 oxygen, action of ordinary, 259 

 experiments as to possible use 



by athletes, 260-263 

 Fleuss diving apparatus and 



diluted supply of, 263-265 

 ozone, destructive powers of, 253 

 discoveries of Andrews and Tait 



with regard to, 252 

 experiments of Schonbein with 



regard to, 251, 252 

 methods of producing, 252, 253, 



258 



nature of, 252 

 proportion of, to fresh country 



or sea-coast air, 253 

 result of experiments with regard 



to, 259 



signification of name, 252 

 therapeutic value and uses of, 



258, 259 

 use in water-purification, 256, 



258 

 Geology, Darwin's discoveries in, 



24 

 table showing history of man in 



Western Europe, 384 bis 

 Germany, custom of eating preserves 

 with meat in, prevalent, 358 

 predominance of scientific know- 

 ledge in, 8 

 Gnats, Anopheles, malaria germ 



carried by, 3 

 Stegomyia, yellow fever germs 



carried by, 2, 3 



Gorgas, Colonel, work of, in connec- 

 tion with yellow fever and 

 malaria, 2-5 



"Gossamer," origin of term, 289 

 27 



Grassi, discovery of the history of the 



eel by, 70-72 

 Green-flies, 322 

 Green tree-frog, 49, 50 

 Griffin, heraldic, 116 

 Guinea-pig, native home and original 



introduction of, 360, 361 

 various names given to, 360, 361 



Halley, Edmund, astronomical dis- 

 coveries of, 226 

 date of death, 230 

 foundation of Royal Society Club 



by, 230 



law of movement of comets dis- 

 covered by, 226, 230 

 Milton and, scholars of St. Paul's 



School, 228, 229 

 Newton and, friendship of, 230 

 Halley's comet, 226, 230 

 Hansen, leprosy-bacillus discovered 



by, 240 

 Hay fever, individual susceptibility 



to, 102, 104, 105 

 probable cause, 105 

 similarity between vegetable 



poisonings and, 105 

 Heart, action of nervous system upon, 

 in man and higher animals, 



151 

 muscular contraction, cause of, 



15. 'Si 



rate of beat in higher and lower 



animals, 152-154 

 in human species, 151, 152 

 significance of its beat, 147, 148 

 valves, action of, 149 



Hedge-sparrow, 267 



Henslow, Professor, Darwin as in- 

 fluenced by, 36 



Herschel, Sir John, definition of 

 word "species" by, 14, 

 15 



Hertwig, Professor, German repre- 

 sentative at Darwin Cen- 

 tenary Celebration, 33 



Hill, Dr. Leonard, experiments of, 

 with regard to use of oxygen 

 gas, 260-265 



Hipparion horse, 84, 85, 86 



Hippopotamus age, 380, 386 



Histology, origin of 176 



Hook, Robert, Micrographia by, 173, 

 288, 289 



