XIV CONTENTS. 



solanum (336). Atropa belladonna (337). Hyoscyamus (338). 

 Tobacco not attacked (339). Stramonium attacked (340). 

 Comparative effects on wild and cultivated plants (341). Mode 

 of operation (342). Numerous cruciferous plants attacked (343, 

 344). Horse-radish (345). Tomato (346). Vastator on Indian 

 corn (347). On wheat (348 351). Not on the oat (352). 

 Wild barley grass (354). Seedling pasture grass (355). Jerusa- 

 lem artichoke (357). Nettle (358) Mallow (359). Hearts- 

 ease (360). Coreopsis tinctoria and Balsam (361). Parsnip 

 (362). Chickweed (363) Young elders (364). Geranium molle 

 (365). Plantain (366). Groundsel (367). Shepherd's purse 

 (368). Spurge (369). Marigold and Thistles (370). Peach and 

 Nectarine (371). Celery (372). Probably other plants also 

 (373). Remark (374). PAGE 83. 



CHAPTER XV. 



INJURIES SIMILAR TO THOSE CAUSED BY THE VASTATOR, 

 PRODUCED BY OTHER APHIDES. 



Aphides, numerous species of (375). Aphis of the hop (376). 

 Aphis of the cabbage and turnip (377). Aphis of the pea (378). 

 Instance of mischief by [Kirby] (379). Bean aphis (380). 

 Apple-tree aphis (381). Sugar-cane (382). Aphis of larch 

 (383). Rose-tree aphis (384). Aphis on couch-grass (385). 

 Aphides generally (386). PAGE 91 



. CHAPTER XVI. 



ON THE EXCESSIVE APPEARANCE OF PARTICULAR INSECTS. 



Natural balance in the relative numbers of living creatures (3S7). 

 This balance occasionally disturbed (388). Excessive appear- 

 ance of Aphis vastator (389). Instance at Brighton (390). 

 Insect plagues recorded in the Old Testament (391). Kirby and 

 Spence (392). Ravages of the May-beetle (393, 394). Ravages 

 of several species of insects (395, 396). Bostrichus typographus 



