Vl'ii CONTENTS. 



CHAPTER II. THE TISSUES. PAGE 



27. The Connexion of the Cells 128 



28. Intercellular Spaces . . .130 



29. Forms of Tissue .."',. . .131 



30. General Morphology of the Tissue-Systems 144 



31. The Primary Tegumentary Tissue .153 



32. The Fundamental Tissue-System 159 



33. The Vascular Tissue- System 170 



34. Histology of the Development of Secondary Members . . . .184 



35. The Formation of Secondary Tissue . . .... . 1^1 



36. Formation of Tissue in consequence of Injury . . .. . . 213 



PART III. THE CLASSIFICATION OF PLANTS. 

 Introductory . . *. . . . . . . . 216 



GEOUP I. THALLOPHYTA . . . . ' -^ , '. . .220 

 Class I. Algae 221 



Sub-Class I. Cyanophyceae (Phycochromacese) . ... . 231 



Order 1. ChroococcaceaB . . . ,,.,.. - . 233 



,, 2. Nostocaceae . '. . .''.'. .233 



3. Oscillariaceae . . . . .233 



4. Rivulariaceae 233 



,, 5. Scytonemacese 233 



Sub-Class II. Chlorophyceae ' .. . . . . .. .234 



Series I. Protococcoideae . .' . . . . . 236 



Order 1. PleurococcaceaB . . . ... . 236 



2. Protococcacete . . ..... 236 



^ - Series II. Volvocoideffi . . . . ' . . . ,237 



Order 1. Chlamydomonadaceae ...... 237 



2. Volvocaceae . 237 



Series III. Siphonoideae ... . , .. . . 238 



Order 1. Siphonacete . . . . .,*'- . 238 



2. Cladophoraceas . . . . . . .241 



,, 3. Hydrodictyaceae . . . . . . 242 



Series IV. Confervoidesa . . 24'3 



Order 1. Conjugatae . . . . . .... 244 



2. Ulothrichaceas . . ...... . . 246 



3. Cbaetophoraceae . . . ... . . 247 



4. Ulvaceae ^. .' .248 



5. CEdogoniaceae . . . V . .248 



6. Coleocha3tacea3 . 249 



-Series V. Charoideaa . .251 



- Order 1. Characeaa 251 



Sub-Class III. Phaeophycc-83 . . . . ... .255 



Order 1. Syngeneticas .... %' ' . . 257 



2. Diatomaceae . 258 



Series (a). Phaeosporeae . . ... . . . 258 



OrderS. Ectocarpaceae . . ' - f . / . ... 259 



