viil CONTENTS. 



CHAPTEK II. THE TISSUES. 



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 191 



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 (Phycochromaceoa) .... 231 



Order 1. Chroococcaceae 233 



2. Nostocaceae 233 



3. Oscillariaceaa 233 



4. Eivulariaceae 233 



5. Scytonemaceae 233 



Sub-Class II. Chlorophycese 234 



Series I. Protococcoideae 236 



Order 1. Pleurococcaceae 236 



2. Protococcaceae ....... 236 



Series II. Volvocoideae ..*...,. 237 



Order 1. Chlamydomonadaceae 237 



2. Volvocacese 237 



Series III. Siphonoidete ..... 238 



Order 1. Siphonaceae 238 



2. CladophoracesB 241 



3. Hydrodictyaceaa 242 



Series IV. Confervoideae , . 243 



Order 1. Conjugataa 244 



2. Ulothrichaceae 246 



3. Chaetophoraceae 247 



4. Ulvacete 248 



5. (Edogoniaceae 248 



6. Coleochaetaceaa ....... 249 



Series V. Charoideae 251 



Order 1. Characeae . 251 



Sub-Class III. Phaeophyceae ... , 255 



Order 1. Syngeneticae ....... 257 



2. Diatomaceae . 258 



Series (a). Phaeosporeae , 258 



Order 3. Ectocarpaceae .... , 259 



