TABLE OF CONTENTS. xi 



Ointment for the Southern " screw-worm," 03. Sulphur for infested 

 fowls and cage birds, 62. Poisons for some household pests, C2. Lon- 

 don jjurple for destroying ants, 62. Attracting and trapping house-flies 

 and other domestic pests, 02. Attracting insects mentioned to shelter, 

 baits, etc., for their convenient destruction, 63. 



PKEVENTI VES OF INSECT DEPKED ATIONS 63 



The difference between preventive and remedial measures. Go. Au 

 " insect attack " may be differently construed, 63. Cultural preventives, 

 as high culture, rotation of crops, selection of seed not liable to attack, and 

 late sowing, 63. Offering attractive food-plants as a lure, 64. Tarred 

 cloths or tin-bands about tree-trunks, 64. Washes to prevent egg-de- 

 posit, 64. Mounds of earth about the base of peach-trees to prevent the 

 borer, 64. Paper rolls for protecting cabbage-plants, etc., 64. Cotton-bands, 

 against the white-marked tussock-moth, 64. Gas-tar paper, against the 

 carpet-bug, 64. Printer's ink for same purpose, 04. Bagging, against 

 the clothes-motli, 64. Powdered borax, alum-water, tar-water, carbolic 

 acid and chalk for expelling the cockroach, croton-bug and ants, 65. 

 Naphthaline, for insect collections, 05. A wash for dried plants, 65. 

 Whale-oil soap, to repel curculio, 65. Spent hops to protect cabbages, 65. 

 Tansy tea, to repel flea-beetle, etc., 65. 



A NEW PRINCIPLE OF PROTECTION FROM INSECT 



ATTACK 66 



Preventives better than remedies, 06, Clean culture and vigorous 

 plant growth are valuable preventives, 66. Of still greater value are 

 preventives against the deposit of insect eggs, 66. Substances which may 

 be employed for the purpose and their operation, 66. Insects guided 

 in oviposition by the sense of smell, 67. Acuteuess of insects in discern- 

 ing the proper plant for oviposition, 67. Wholly dependent upon some 

 sense for the knowledge they display, 67. " Instinct " no explanation, 68. 

 Can be explained by the supposition that they are directed by the sense 

 of smell, 68. Degree to which this sense may be cultivated in man, 68. 

 Its acuteness in domestic animals, 68. Uncertainty of the location of the 

 smelling-organs in insects, 69. Different opinions in regard to their lo- 

 cation, 69. Latest and most reliable views upon the subject, 69. Evi- 

 dences of insect attraction by odors, 69 : beetles and flies, to decaying 

 matter, 69 : NoctuidcR drawn to the bait in sugaring, 70 : Male moths 

 attracted to newly emerged females, 70 : attraction of Ileliconia Chari- 

 tonia to female clirysalids, 70. Remarkable assemblage of male Callo- 

 samia Prometliea in Albany, 70. Recent discovery of scent-producing 

 organs in male Lepidoptera, 71. Observations upon Polyphylla variolosa 

 male, digging in the ground for the female, 71. Special odors pertaining 

 to male butterflies, 72. Sight less important than smell to nocturnal in- 

 sects, 73. Some females are so concealed that they could not be found 

 by the male through sight alone, 73. Reason why a moth should be sen- 

 sitive to the odor of its caterpillar food-plant, 73. Insects which would 

 not require the guidance of sniell in oviposition, 74. The operation of 

 counterodorants in preventing egg-deposit, 74. The odors not necessarily 

 repulsive to insects, 74 : Strength and permanency desirable properties. 

 74. Substances mentioned which may serve as counterodorants, 75. 



