Ill 



B, Heteroplastic ti ssues » 136 



"X CorreiaTlcm-heteroplasms 137 



# 2 , Callus . . , 139 



External form of the callus \ 142 



Origin of the callus 142 



Life history of the callus , , 143 



Histology of the callus , 148 



Conditions of callus formation 150 



Formation of ergans in callus /..',,. 154 



3, Wound-wood , ,..,..........* 156 



Histological composition and course of fibres.. 



in woimd-wo«d , 157 



Tissues furnishing v;ound-wood 1^2 



Outer form and period of development of v/ound-» 



v^ood. Conditions of Its formation 163 



Tissues resembling T70und~wood , , . . , 164 



4, Wouni-ooyS: 167 



6.- Oalla , . , , 170 



a« Kataplasmes ..,....♦.,. , 176 



1. Primary tissues ; 160 



£, ^eeondary tiSFues 182 



Abnormal \7ood 183 



Abnormal bark , 185 



Witoheg-brooms and staghead 187 



b. Prosopiasmas .,».... • . 189 



1« E^tetnal forfe and oourse of development 

 *X , prosoplasmas l^J- 



1. l<eaf fold galls 191 



ti Sao galls 192 



3^ J7all04 galls 193 



4. Medullary galls 195 



II. HlB-feiilogicaX ^ 199 



,1. pretext Ive tissues 205 



Jlpidermal tissues 805 



Jlifchanical tissues 208 



2, Wiitritive tissues ...» 214 



Hu^Htive epidermis ...., 215 



Kut^j'itive parenchyma 215 



3. Assimilatory tissues 218 



4. VasovlajT tissues /. 218 



5 , Aerating tissues 219 



6, Secretlous and secretion reservoir 220 

 APPENDIX 223 



Cytology 223 



Phenomena «»f degeneration 225 



Micro-chemical condition 226 



CHAPTEfi VI 

 GMERAI OBSERVATIONS ON THE ETIOLOGY AHP DEVELOPMENT OP PATHt 

 WijVGICAL PLANT TISSUES, DISCUSSIONS OP GENERAL PATHOLOGY. 



THEORETICAL mTTER. .227 



^* QPj;>C9rn^ng the active ' factors \ W'.V. .....',, .\ 232 



'i» Jnflue?ice of mechanical pressure and strain. .... 235 



2 i- Tfiiqperature 236 



3. Light 237 



4r Chemical substances 237 



Trophic effects ♦ 239 



Toxic effects , 240 



♦3» Turgor, osmotic pressure and diffusion-Aurrents. 241 



B» On reaction to stimuli ,,.-.» 245 



i. Size Of the cells I * . . . 247 



2 . Porm of the cells 248 



3 r Internal structiire of the cells ......... ^ £49 



Q« ^fT^^ <«>T!> aclty Ut reaction _,.. 251 



1. epidermis...,..,... ...; .'.,... 255 



ti Gre"uad tlssu# , 25i 



3. Vasoftlar, bundle tissue .......; 25* 



Ing remarks. ........ u 257 



