CONTENTS. XH1 



feet insect (264) ; named " vastator," and why ('265). Curtis' 

 description (266). Astonishing fecundity (267 269). Continu- 

 ance of the. species (270 273). Mode of attack on the plant 

 (274, 275). Restlessness of the insect (276 278). Flight of 

 the insects (281, 282). Progress of the mischief (283285). 

 Action on different varieties (286,287). Effect of moisture after 

 attack (288, 289). Attack at different ages of the plant (290, 

 291). Relation of the disease to this insect (292 294). 

 PAGE 63. 



CHAPTER XII. 



TURNIP DISEASE. 



White turnips, method of attack thereon (296, 297). Effects of the 

 attack (298 301). Spiral vessels (302, 303). Effluvia from rot 

 (304). Effects of time (305, 306). Fungi (307). Aphis bras- 

 sicae, description of, (309, 310); its habits (311, 312). Swede 

 turnip (316). Conclusion (318). PAGE 73. 



CHAPTER XIII. 



BEET, SPINACH, AND CARROT DISEASE. 



Beet attacked by the Aphis (319). Mode in which the disease pro- 

 gresses (320 322). Number of insects on a plant (323). An- 

 other species of Aphis (324). Spinach attacked (325). Effects 

 of attack (326). Action of disease (327). Effect of rain on dis- 

 eased plant (328). Carrot subject to the disease (329). Opera- 

 tion of disease upon it (330,331). Disease identical in all plants 

 attacked (332). PAGE 79. 



CHAPTER XIV. 



THE APHIS VASTATOR ON OTHER PLANTS. 



Solanum dulcamara and nigrum attacked by the vastator (334). 

 Its effect upon them (335). Greenhouse and other species of 



