Viii TABLE OF CONTENTS. 



London Purple as an Insecticide 3-1 



Its analysis, 34. A refuse material in the manufacture of analine dye.s, 

 34. About equal in efficacy to Paris green, 34. In what respects prefer- 

 able to Paris green, 34; evidence of its being less poisonous, 34. Diluents 

 employed in dry mixture, 35. Degree to which it may be reduced, 35. 

 Different degrees of water dilution for different insects, 35. Should not 

 be used in greater strength than necessary, 35. Useful in the destruction 

 of the apple-worm, 35. Prof. Cook's experiments with it upon apple- 

 trees, 35. Directions of Hemingway's London Purple Company for its 

 use, 36. 



Pyrethrum as an Insecticide 36 



Species of Pyrethrum from which the Persian and Dalmatian insect 

 powders are derived, 36. The Persian powder long known, 36. Until 

 very lately only employed against household pests, 36. Its effects upon 

 flies in a closed room, 36. May be inhaled with safety, 36. Probability 

 that its range of usefulness will be greatly extended, 37. The plants be- 

 ing cultivated in this country, 37. Mr. Milco's " Buhach," 37. Promise 

 of its production at a low cost, 37. Seed distributed by the Department 

 of Agriculture, 37. Circular by the Department, with instructions for the 

 cultivation of the plants, preparation and modes of application of the 

 powder, 37. May be applied as a dry powder, either with or without di- 

 luents, 37. Diluents used, 37. The mixture improved by standing for 

 two days, 37. Application in fumes, 38. Method of burning, and effects 

 of the smoke, 38. Convenient means for destroying insects infesting furs, 

 feathers, books, etc. , 38. Production of an alcoholic extract, 38. Dilu- 

 tion, application, and effects of the extract, 38. A water solution deemed 

 preferable to other preparations, 38. The powder dissolves in water, 38. 

 Small quantity of the powder required, 38. The solution injured by 

 standing, 38. Tea or decoction from the unground flowers, 38. How 

 the tea may be made in large quantity, and used, 39. Effects of the water 

 solution upon insects, 39. Valuable for the destruction of cabbage cater- 

 pillars {Pieris raped), 39. Prof. Cook's experiments and conclusions, 39. 

 It will kill the Colorado potato-beetle, 39. Does not kill the squash-bug 

 or the harlequin cabbage-bug, 39. Serviceable against aphides, striped 

 blister-beetle, flea-beetles and the grain weevil, 40. Hymenoptera readily 

 affected by it, 40. Order in which some insects are affected by its fumes, 

 40. Reference to the recent literature upon the subject, 40 



Hellebore as an Insecticide 40 



What it is, 40. When its iusecticidal properties were first discovered 

 in England, 41. When introduced in the United States, 41. Dr. Fitch's 

 enthusiastic praise of its virtues, 41. May be conveniently applied with 

 a dusting box, 41. Directions for its application, 41. Test of its strength, 



42. Cost and quantity for garden uses, 42. How prepared for liquid ap- 

 plication, 43. Made more effective by the addition of flour, 42. A specific 

 for the destruction of the currant-worm, 42. Equally efficacious against 

 most of the " saw-fly " larvae, 43. Useful for destroying the "slugs " in- 

 festing rose-bushes, pear-trees and raspberries, 42. Directions for use on 

 rose-bushes, 42. The " poke-weed " should also have similar properties, 



43. Reference to writings upon the iusecticidal properties of Hellebore, 

 43. 



