152 INDEX. 



confounded with another Aphis on wheat, 86 ; did not appear till 

 August, 87 ; does not live on the oat, ib. ; found on other grasses, 

 ib. ; Jerusalem artichoke, &8 ; the nettle, ib. ; the mallow, ib. ; 

 heart's-ease, ib. ; Coreopsis tinctt<ria, ib. ; the parsnip, 89 ; chick- 

 weed, ib. ; elder, ib. ; Geranium molle, ib. ; the plantain, ib. ; 

 groundsel, ib. ; shepherd's purse, ib. ; spurge, ib. ; marigold, 90; 

 peach, ib. ; celery, ib. ; Convolvulus battata, ib ; excessive ap- 

 pearance of, an instance of loss of balance in nature, 95, 96 ; re- 

 medies for, 103,119; reason for its attacking old leaves, 113; 

 changes its state when the plant is killed, 114 ; not destroyed by 

 rain, 119; artificial remedies for: removal of diseased leaves, 

 120 quicklime, ib. ; importance of the period of its appearance, 

 121. 



Apple-trees affected by Aphis lanigera,92; crops of, almost de- 

 stroyed. 93 ; progress of A. lanigera, ib. 



Autumn planting, 121. 



Bean plants attacked by an Aphis, 92, 131. 



Beet attacked by the Aphis vastator, 79 ; mode and progress of the 

 attack, 80 ; suffers most when running to seed, ib. ; number of 

 Aphides on one plant, xxxii., 80. 



Belladonna attacked by Aphis vastator, 84. 



Berkeley, Mr., opinion respecting the potatoe disease, 55, 56. 



Bostrichus typographus destructive to firs in certain years, 98. 



Botrytis infestans, 57 ; figured by Mr. Berkeley, ib. 



Boussingault and BaBchmann, ultimate analysis of potatoe by, 68. 



Bread made from potatoes, 23 ; adulteration of, with potatoes, ib. ; 

 with diseased potatoes, 137; with alum, ib. 



Brown-tail moth, vast numbers of, in 1782, 98. 



Butyric acid found in rotten potatoes, 41. 



Cabbage attacked by the Aphis vastator, 85. 



Carrot attacked by Aphis vastator, 81 ; mode of attack, ib. ; most 

 liable to attack when running to seed, 82. 



Celery attacked by the Aphis vastator, 90. 



Chama, 27. 



Chickweed attacked by Aphis vastator, 89. 



Chrysopa perla destroys Aphides, J04. 



Cockchafers, immense number of, 97 ; grub of, very destructive, ib. 



Commissioners to investigate the potatoe disease, xxix. 



Convolvulus battata in use before the potatoe, 15; cultivated by 

 Gerard, 16 ; modern attempts to naturalize, ib. ; attacked by the 

 Aphis vastator, 90. 



Coreopsis tinctoria attacked by the Aphis vastator, 88. 



Couch-grass attacked by the Aphis vastator, 94. 



Council of health proposed, 129 



CruciferaB very liable to the attack of the Aphis vastator, 85. 



Curl, description of, 108, 109. 



Curtis, description of Aphis rapas by, 67. 



