xiv LIST OF ILLUSTRATIONS 
Cerebral Hemispheres of Man 
Complex Neuron from Cortex of Human 
Brain (after Stohr) 
Tactile Organs (after Korotneff and Vej- 
dovsky) 
Tactile Organs of Insects (after Von Rath 
and Jobert) - 
Organs of Touch of Frog and Duck (after 
Merkel and Carriére) 
Touch-Corpuscle from Finger Tip of Man 
A Pacinian Corpuscle 
A Deep-Sea Fish (Zretmophorus) (after 
Giglioli) - 
Taste-Organs of a Wasp (after Will) - 
Taste-Bud from the Tongue of a Rabbit 
(after Engelmann) 
Olfactory Organs of Crayfish, Millipede, 
and Wasp (after Leydig and Hauser) 
Tip of Optic Tentacle of Garden-Snail in 
section 
Diagram of a Comb-gilled Snail (after 
Lang) - 
Olfactory Cells from an Amphibian (Pro- 
teus) (after Stricker) 
Tentaculocysts of Jelly-Fishes (after 
Heckel) - 
Ceatral Nervous System of Lob-Worm 
(Arenicola piscatorum) (after Vogt and 
Yung) - 
Otocyst of a Heteropod (Pterotrachea) 
(after Claus) 
Otocysts of Limpet (Fate//a) 
Otocyst of Lobster (Homarus) - 
Opossum Shrimp (d@yszs) (after Ger- 
steecker) - 
Chordotonal Organs (after Graber) 
Stridulating Organs and Ears of Grasshop- 
pers (after Landois, Graber, and Fischer) 
Body of an Ascidian Tadpole in section 
(after Kowalevsky) 
Diagram of the Membranous Labyrinth of 
a Lower Vertebrate (after Wiedersheim) 
Euglena (partly after Franzé) 
Rhopalia of a Jelly-Fish (after Heeckel) 
Eye-Cup of a Star-Fish 
Eye-Spot of Nais (after Carriére) 
Direction-Eyes of « Leech (Hzrudo), a 
Limpet (Patella), and an Arrow-Worm 
(Sagit/a) (after Whitman, Carri¢re, and 
O. Hertwig) 
Head of Male Honey-Bee (AZis mellifica) 
Mosaic Vision (after Johannes Miiller) 
Sections through the Compound Eye of an 
Earwig (Forficuda), and the Camera Eyes 
of a Spider (Zpeira diadema), and a 
Marine Annelid (Alcéofe) (after Carriére, 
Grenacher, and Heckel) 
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44 
Page 
Diagrammatic Sections through Camera 
Eyes of Cephalopods (after Lang) - 45 
Cross Section through the Head of a Tad- 
pole (from Selenka) = - 46 
Pineal Eye of a Tuatara (Hatteria) (after 
Spencer) - 47 
YounG ORANG-UTANS (Sima satyrus) 52 
A Limpet (Patel/a vulgata) leaving its Scar 
at Ebb-tide - - 57 
Nest of the Eider-duck (Somateria mollis- 
sima) (photo. by R. A. L. van Someren) 60 
Relations between Animals and Plants 
(partly after Scott-Elliot) 65 
The Sundew (Drosera) (from Kerner) 69 
Venus’ Fly-Trap (Dion@a muscipula) (from 
Kerner) 70 
PITCHER-PLANTS (Wepenthes destillatoria) 72 
Bladderworts (Utricularia) (from Kerner) 73 
Traps of Bladderwort (U¢ricelarza) (from 
Kerner) 74 
Liverwort (Frzllania dilatata), showing 
cups in which a Rotifer (Ca/idina sym- 
biotica) lives (from Kerner) 75 
Cross-section through a Lichen (Col/ema) 
(from Kerner) 76 
A Ray-Animalcule (Avachnocorys circum- 
texta) (after Heeckel) 77 
A House-Fly (fusca domestica) killed by 
Fly-Mould (Zmfusa musce) (from Ker- 
ner) - a 77 
Bacteria (from Kerner) 78 
Insect-Galls on Leaf of Oak i ipseus 
(from Kerner) 79 
Raphides (from Kerner) 80 
Ant-sheltering Acacia (4. spherocephala) 
(after Schimper) 81 
A Saw-Wort (Serratula lycopifolia) de- 
fended by Ants (Formica exsecta) 82 
Diagrammatic Section through a Simple 
Flower - 84 
The Nottingham Catch Fly (Sz/ene nztans) 
visited by a moth (Dzanthecia albi- 
macula) (from Kerner) - 86 
Cross-pollinated Flowers (from Kerner) 87 
Pollination of Monkey Musk (Afimulus 
luteus) (from Kerner) 90 
A Teasel (Dipsacus lactniatus), showing 
Water-cups (from Kerner) 92 
Snowdrop (Galanthus nivalis) (from Ker- 
ner) 93 
Flower of Plumbago Europea (from Ker- 
ner) 93 
Section through Flower of a Honeysuckle 
(Lonicera alpigena) (from Kerner) 94 
Fruit of Linnea borealis (from Kerner) 97 
Fruits of Goose-grass (Galium aparine) 
(from Kerner) : 93 
