INDEX. 373 



PAGE 



Oak, failure of the crop of its acorns ... . 287. 309 



Oak-timber, observations on its grain . . . ' . .92 



liable to be mistaken for Spanish chesnut . . .*] 100 



Onion, on its management . . . . . . .181 



Orange-trees, effect of liquid manure upon . . . . . 213 



under high temperature ..... 239 



Oxygen Gas discharged by leaves . . . . . 341 



PALMS ......... 142 



Parasitic plants, their adhesive processes recede from the light, and press 



against opaque bodies . . . . . . 166 



Parents, on the comparative influence of male and female on their offspring . 343 

 Pastinaca sativa, experiments made relative to the extension of its roots in dif- 

 ferent soils . . . . . . . . . 159 



Peas .......... 164 



, crops of, preserved from the attacks of mildew . . . 207 



, experiments in cross-breeding, with varieties of . . 279 



, green, account of a method of obtaining very early crops of . . .312 



, blue Prussian ........ 279 



Peach, Acton Scott . . . . . . . . 273 



Peach- houses, on their construction . . . . . .186 



Peach-stocks . . . . . . : . 274 



Peach-tree, on its early puberty . . . . . 1 99 



, upon the proper mode of pruning it in cold and late situations . . 226 



, grown in pots ....... 212 



Pear-tree, on its culture . . . . . . . . 20 1 



, its fruitfulness induced . . . . . .201 



, on the mode of propagation of a species of fungus which destroys the 

 leaves and branches of ....... 207 



Pear, Aston town ........ 203 



, St. Germain ....... . . 202 



, Crassane . . . . . . .203 



Perspiratory vessels . . . . . . . . 98 



Perspiration of trees greatest in August . . . . .110 



Pine-apple, upon its culture without bark or other hot-bed . . . 242 



, observations on its culture . . - . . . 260 



, description of a pit for the . . , . . 261 



, temperature for . , . . . .264 



, on its cultivation . . . . . . . 302 



, on watering the . . . . . . . 305 



, black Jamaica . . . . . . 304 



, Enville . . . . . . . .303 



, Green olive ........ 304 



, St. Vincent's ....... 304 



, White Providence . . . . . . 303 



Pine-stove, an improvement in its construction suggested . . .271 



