CONTENTS. 
CuapTer I.—INTRODUCTION. 
Pace. 
Nuclear division, . . 2-30 
Karyokinesis in cells of the ewe planta’ in qin seateceuhenee are 
developed, dis ‘ F : < ‘ . 2-10 
Dictyota,  . a a F Fi ‘ i 2 
Erysiphe, 5 2 - ‘ ‘ F : 7 
Mitosis in pollen mother-cells, : . : . 11-30 
The first or heterotypic mitosis, ; . 11-26 
Resting nucleus and the development wt the auvdtnasin spirem II 
Development of the spindle, é és : : 15 
Chromosomes, . , ‘ ‘ : : : 17 
Metakinesis, : ‘ F : e ¢ 20 
The anaphase, . és : : : : : 22 
The telophase, ‘ P 3 , F : 23 
The nucleolus, . é : F - é 25 
The second, or homotypic diviciois, : , : ‘ 27-31 
Cell division, : F . - 31-44 
The type of the higher ait: ‘i ‘ : ‘ 3 31 
Free cell-formation, 3 , : . : . 33 
Cell-cleavage, 36 
Cell-division in Dictyota andl Si pakdulots : % 3 H 41 
The centrosome and the blepharoplast, : 44 
The significance of the sexual process and the ninnerieadl reduedion of 
the chromosomes, . 49-60 
Cuaprer Il.—FeEcunpaTion ; Motitz IsoGAMETES. 
Ulothrix and Hydrodictyon, . 61-65 
Copulation of gametes, - 
5 
Ectocarpus, 
CyapTerR IIL. —FECUNDATION ; Non-MotILe IsoGAMETES. 
Spirogyra, : ‘ . : . , . : 67 
Sporodinia, . F F ‘ ‘ 3 : 71 
Closterium and Coamagiinn, . si “ é 71 
Diatoms (Rhopalodia, ee . ‘ é , ‘ 73 
7 
Basidiobolus, “ . . ‘ E . : 
