VI TABLE OF CONTENTS. 



Page. 

 Preventive measures— Continued. 



other supposed protective plants, 123 — protection of Natural Enemies, 



123 — immunity of cotton under trees, 124 — preventing oviposition of 



the moth, 124 — futility of decoctions for this purpose, 125 — road dust, 



125 — early application of direct remedies, 126 — concerted action, 126 — 



early poisoning and hand-picking, 126 — cotton-worm warnings, 127 — 



destroying chrysalides accidentally carried into gin-houses, 127— false 



theories, 127— burning the stalks, 127 — winter plowing, 127 — salt, 127. 



CHAPTER X. 



Eemedies; means of coping with the insect; substances used for its 



destruction 128 



Destruction of the eggs, chrysalides, and moths, 128 — destruction of the 

 eggs impracticable, 128 — little chance for successful destruction of the 

 chrysalides, 128 — destruction of the moth, 129 — lights and fires for at- 

 tracting the moths, 129 — indifferent success with lamps used at Co- 

 lumbus, Tex., 130 — importance of using lamps early in the season, 

 130 — apparent success with lamps near Hearne, Tex., 131 — great at- 

 tractiveness of the electric light, 131 — movable lights, 131 — poisoned 

 sweets and fluids, 131 — fondness of the moths for ripe fruit, 132 — killing 

 moths by poisoned fruit, 132 — method of using poisoned liquids, 132— no 

 results from using poisoned baits late in summer, 133— poisoning the 

 glands of the plant, 133 — cotton-leaf essence and its attraction to the 

 moth, 134 — hand-picking, 135 — mechanical means of killing the worms, 

 136 — shaking off the worms, 136 — poisoning the worms, 136 — ^progress in 

 the use of insecticides, 137 — classification of insecticides, 137 — importance 

 of preparing materials in advance, 138 — arsenical compounds, 138 — safety 

 in their use, 138 — difficulty in determining minimum quantities, 139 — 

 overdoses of poisons, 139— general rules in dry applications, 140 — mixing 

 devices, 141 — ingredients, 141 — wet application, 142 — principles to be 

 followed and ingredients to be used, 142 — comparison of dry and wet ap- 

 plications, 142 — Paris green, 143 — historical data, 143 — liquid application, 

 143 — dry application, 144 — minimum quantities, 144 — patents on Paris- 

 green combinations, 146 — arsenic, 147 — commercial arsenic, 147 — arseni- 

 ate of soda, 147 — Fowlers's solution, 148 — Johnson's dead shot, 148 — Texas 

 cotton- worm destroyer, 149 — London purple, 149 — manufacture and analy- 

 sis, 149 — history of its use, 150 — experience in Alabama in 1880, 150 — ad- 

 vantages and disadvantages, 151 — dry application, 151 — wet application 

 152 — other mineral substances, 153 — salt and saltpeter, 153 — sulphur, 154 — 

 red lead, 154 — road dust, 154 — oils and allied substances, 155 — kerosene, 

 155 — former methods of application, 155 — invention and perfection of 

 emulsions, 156 — method of preparing emulsions, 157 — formula for per- 

 fected emulsion, 158 — experiments with imperfect emulsion in 1880, 158 — 

 experiments with perfected emulsions, 160 — oil of creosote, 162 — oil of 

 tar, 162 — gas-tar water, 162 — carbolic acid, 163 — cotton-seed oil, 163 — 

 vegetable insecticides, 164 — pyrethrum, 164 — history, 164 — mode of culti- 

 vation, 165 — success in cultivating the plant in America, 166 — ^preparation 

 of the powder, 167 — its use as an insecticide, 168 — advantages and disad- 

 vantages, 168 — active principle in pyrethrum, 169 — its effects on cotton- 

 worms, 169 — imported vs. Californian powder, 170 — dry application, 170 — 

 minimum quantities of dry powder, 171 — dry powder mixed with flour 

 and other ingredients, 172 — application in fumes, 174 — alcoholic extract, 

 174 — exi)eriments with extract obtained by distillation, 174 — experience 

 with extract obtained by repercolation, 176 — use of the powder in simple 



