CONTENTS. XV 



(397). Locust plagues (398, 399). Wasps (401). Honeydew 

 (402). Controlling agents (404). The exaggerated increase of 

 particular insects not continuous (405). PAGE 95. 



CHAPTER XVII. 



RELATION OF THE VASTATOR TO OTHER APHIDES AND TO 

 FUNGI. 



Analogy between the different aphides (406 409). Probable effect, 

 of the predominance of one species (410). Destructive power of 

 aphis (411). Relation of fungi to aphides (412). PAGE 101. 



CHAPTER XVIII. 



NATURAL REMEDIES FOR THE PRESENT DISEASE AMONG 

 PLANTS. 



Animals destructive to aphides (413). Coccinelia (414, 415) ; 

 Profusion of (416). The Gauze-wing (418). Larvae of Sylphidae 

 (419). Parasitic Hymenoptera (420, 421). Other Hymenoptera 

 (422). Earwing and species of Acarus (424). Spiders (425). 

 The soft-billed birds (426, 427). Ducklings (428). PAGE 103. 



CHAPTER XIX. 



RELATION OF THE GANGRENE TO OTHER DISEASES OF THE 

 POTATOE. 



The curl (430, 431). Hollins' description; varieties of curl (432 

 434). Putsche and Vertuch's description (435). Curl probably 

 identical with present disease (436). Curl from attack of vastator 

 (437). The rust (438). PAGE 108. 



