334 



INDEX 



Natural selection, 119-120 



Nature and God, 20 



Naturalist's Voyage round the 



World, 46 

 Nausicaa phceacum, the, 185 

 Nineteenth century, work of the, 



18 

 Nomenclature, scientific, 185 

 Nucleus, the, 179 



Oken, L., 144 



„ on embryonic development, 

 224 



Ontogeny, 231 



Optimism of early Darwinians, 166 



Origin and Evolution of the Sense- 

 organs, 286 



Origin of Species, the, 122 



Over-individuals, 247 



Ovi di mare, 93 



Ovum, the, 268, 273 



,, , discovery of the, 58 



Paleontology, 149 



Palingenesis, 231 



Pampas, fossil remains in the, 112 



Paris, Freethought Congress at, 



319 

 Pathology, Virchow's reform of, 57 

 Paulsen, Professor, 304 

 Peak of Teneriffe, Haeckel climbs 



the, 250 

 Pelagic sweepings, 70 

 Pemmatodiscus gastrulaceus, the, 



277 

 Persephone-impulse, the, in 



Haeckel, 256 

 Philosophy and observation, 156 



,, and science, 202 



Philosophy, Haeckel's work in, 



305 

 Phylogeny, 231 



Physician, Haeckel as a, 80 



,, , qualities of the, 53 

 Pithecanthropus, the, 167, 308 

 Plankton, 70 

 Plankton-studies, 290 

 Plant or animal, priority of the 



205 

 Plastidules, 284 

 Political views of Haeckel, 301 

 Polyps, 175 



Popular works, why written, 262 

 Potsdam, Haeckel's birthplace, 30 

 Private teacher, Haeckel as, 100 

 Profession, choice of a, 53 

 Professor of Zoology, Haeckel 



appointed, 100 

 Progressive evolution, 168 

 Promorphology, 215 

 Protestant religion, character of 



the, 134 

 Protists, the, 206 

 Protistology, 206 

 Puerto del Arrecise, 250 

 Pupa, the, 227 



Kabl, Professor, 311 

 Radiolaria, the, 93, 289 



, shells of the, 95 

 , system of the, 140 

 Rapallo, Haeckel at, 313 

 Realism of Haeckel, 304 

 Beport on the Deep-sea Eeratosa, 



the, 290 

 Beport on the Badiolaria, the, 289 

 Biddle of the Universe, the, 22, 



291, 301-7 

 Bitter, Paul von, donation of, 255, 



299 

 Riviera, marine study on the, 76 

 Rocks, formation of the, 109 

 Roederer, 25 

 Romance nations, religion of the 



134 



ii 



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