XX 



JI. 

 34' 



JS. 

 j'l- 

 4'J- 

 4!. 



4.;- 



44- 

 45- 

 46. 

 47- 

 4^. 

 4'J- 

 50- 

 51- 

 52- 

 53- 

 54- 



Go, 

 fii. 



LIST OF IIJXISTRATIONS 



Suction of sarsaiKirillu stem . 

 Section of sycamore stem 

 Section ot clematis stem 

 Section of date-palm stem 

 Section of pill wort stem . 

 Section of marestail stern 

 Section of club-moss stem 

 Section of rnsh stem 

 Section of i\'y stem 

 Section of lirazilian liana stem 

 Section of mid-rih of rhododendron le: 

 Section of pine leaf 

 Section of blade of laurel leaf 

 Section of mid-rib of laurel leaf 

 Section of blade of sunflower leaf . 

 Section of mid-rib of sunflower leaf 

 Tlie t;r(jwin,L,'-point of a stem . 

 Section of blade of deadly nightshade leaf 

 Section of stonecrop leaf 

 Section of pine leaf . 

 Section of lilade of water-lily leaf . 

 Section of blade of Indian corn leaf 

 Transparent lea\es of a moss 

 Section of the base of a Virginian creeper's leaf stalk 

 Brcathinf( poj-es or "stornata" of monkey-puzzle leaf 

 ■■ Stomata " of tulip leaf 

 Central portion of male be.tjonia flower 

 Central portion of female be,L;onia flowe 

 Stamens from various flowers 

 The tubular corolla of foxtjlove opened 

 Pollen grains falling from stamens of malic 

 Spiny pollen grains of holl\-hock 

 Ivipe stanrens of mallow flower 

 Section of anther of a lib- 

 Compound pollen grains . 

 Sections of pollen grains 

 Stigma of cx'cning primrose with ])olk'n tul 



■AGI-: 



42 



43 

 4^' 

 47 

 4« 

 49 

 5'-" 

 51 

 52 

 54 

 55 

 56 

 60 

 61 

 62 

 63 

 65 

 65 



67 



71 



73 

 77 

 7'J 

 Si 



«5 

 ,S6 

 8S 

 90 

 92 

 93 

 94 

 95 

 99 

 9,S 



lOl-t 



