1)1 



INDEX. 



ACARUS found on the potatoe plant, 61; found in company with 



Aphis vastator, 106. 



Albumen, its probable source, 4; prob.ible composition, 19; in a 

 state of putrefaction in diseased tubers, 40 ; converted into vege- 

 table casein, ib. 



Alcohol made from potatoes, 25 

 Alimentary substances, list of, 131 ; number of, attacked by the 



vastator, ib. 



Analysis of potatoe plant, 17; of potatoe, 18; of solanine, ib. ; of 

 diseased potatoes, 40 ; of potatoes in various years, ib. ; mode of, 

 33 ; ultimate of potatoe, 19 ; of dextrine, 25. 

 Aphides, importance of the family of, 91-94. 



Aphis of the hop, 91 ; of the cabbage and turnip (A. brassicae), 92 ; 

 abundance of, 102 ; of the pea, 92 ; of the bean, ib.; lanigeri, ib.; 

 of the sycamore, 93 ; of the sugar-cane, ib.; on the larch, ib.; on 

 the rose, 94 ; on the couch-grass, ib. ; excessive numbers seen in 

 various places, 96 ; analogy of various species of, 101 ; relation of, 

 to fungi, 102; causes of excess of, ib ; natural remedies for, 103- 

 103 ; artificial remedies for, 118-127; difficulty of destroying, 

 119. 



Aphis vastator, importance of, 62 ; not found alone, 63 ; description 

 of, ib.; states in which it is found, 64 ; size and color of, ib.; 

 measurement of, 65 ; mode of preserving for examination, xxxv. ; 

 identity of, with A. rapae, ib.; reasons for its name, ib.; generation 

 of, 6S ; fecundity of, 66 ; questions respecting generation of, ib. ; 

 attacks the potatoe plant, 69-71 ; unpleasant sensation caused by, 

 70 ; widely diffused, 71 ; migratory habits of, ib. ; does not attack 

 all potatoes alike, ib. ; scarcely affects wild potatoes, ib. ; damages 

 plants in ratio with their growth, 72; attacks various plants, 73, 

 141 ; turnip attacked by, 74, 78 ; appears to prefer the turnip to 

 the potatoe, 78 ; beet and mangel-wurzel attacked by, 79 ; spinach 

 attacked by, 81 ; carrots attacked by, ib. ; identity of effects pro- 

 duced by, 82 ; seems to have a preference for the Solanseae, 84 ; 

 found on Solanum dulcamara, 83 ; S. nigrum, ib. ; Atropa bella- 

 donna, 84 ; hyoscyamus, ib. ; stramonium, ib. ; attacks Cruciferae 

 next to Solanaeae, 85; found on cabbage and brocoli, ib. ; horse- 

 radish, ib.; tomato, 86; Indian corn, ib. ; wheat, ib. ; not to be 



