1 
CONTENTS. 
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Letter of Transmittal. . 
Experiments for the Destruction of Chinch-bugs 
Page. 
. 3 
as they Emerge from Fields of Small Grain at 
.. 5 
Harvest. 
Description of Experiments with Barriers and Traps. 
On Contagious Disease in the Chinch-bug. 
On the Relations of Economic Entomology. 
Parasitism of Insects. 
Contagious Diseases of Insects. 
The Beginnings'of Knowledge and the Progress of Investigation 
The Subject in America. 
Work in Illinois in ... 
Spontaneous Occurrence. 
Number and Nature of Experiments. 
Summary of .Economic Results. 
Work of the Year 1891. 
Cultures of Sporotrichum. 
Contagion’and Infection Experiments. 
Outline of Experiments with Sporotrichum globuliftrum . 
Classified List of Experiments. 
Detailed Description of Experiments. 
Work of the Year 1892. 
Field Infection Experiments. 
Classified List of Experiments.. 
Outline of Experiments with Fungus Parasites of Insects. 
Sporotrichnm globuliferum . 
Botrytis tenella . 
Isaria leprosa . 
Detailed Description of Experiments. 
Work of the Year 1893 . 
Detailed Description of Experiments. 
Wont of the Year .. 
General Discussion of Results. 
Experimental Methods. 
Classified List of Experiments. 
Outline of Experiments vith Sporotrichum globuliferum. . 
Description of Experiments. . 
Analytical List of American Articles consulted. 
Laboratory Experiments with Chinch-bugs. 
Mr. Johnson’s Report of Experiments. 
Egg Experiment. 
Immersion Experiment. 
Floating Experiment. 
Conrinement Experiment. 
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19 
20 
25 
25 
27 
27 
29 
30 
33 
36 
38 
40 
60 
61 
62 
65 
66 
66 
67 
68 
83 
83 
88 
92 
96 
98 
100 
102 
141 
177 
178 
179 
1S3 
186 
187 
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