9 
Program 
Tuesday Morning Session , January i , 1924 , 10:00 a. m.; Chemistry 
Auditorium 
18. Methods of Estimating Insect Abundance and Damage. Sym¬ 
posium. (10 minutes each). 
Statistical Work in Entomology. J. A. Hyslop, Washington, D. C. 
The Use of Biometrical Methods in the Interpretation of Codling 
Moth Experiments. F. Z. Hartzell, Fredonia, N. Y. 
Methods of Estimating Insect Abundance and Damage. 
The Gipsy Moth. A. F. Burgess, Melrose Highlands, Mass. 
The San Jose Scale. J. J. Davis, Lafayette, Ind. 
The Boll Weevil. W. D. Hunter, Houston, Texas. 
Grasshoppers. Stewart Lockwood, Billings, Mont. 
The Hessian Fly. W. H. Larrimer, West Lafayette, Ind. 
Value of Statistical Methods in Entomology. C. L. Marlatt, 
Washington, D. C. 
Reading of Papers and Discussions 
19. Recent Developments in Greenhouse Fumigation with Hydro¬ 
cyanic Acid Gas. (10 min.) (Lantern). E. R. Sasscer and C. A. 
Weigel, Washington, D. C. 
Device for dropping cyanid in jars simultaneously in commercial houses. Value of 
liquefied hyrdocyanic acid gas. Preliminary notes on calcium cyanid. Plant 
tolerance. 
20. Lubricating Oil Emulsion as a Control for Chrysomphalus 
aonidum in Greenhouses. (10 min.) C. A. Weigel and Miss B. M. 
Broadbent, Washington, D. C. 
Results of recent experiments in controlling Chrysomphalus aonidum on Kentia 
palms, Ficus, and other ornamental plants. 
21. The Use of Lubricating Oil Emulsions on Greenhouse Scale 
Insects. (5 min.) C. C. Compton, Aurora, Ill. 
22. Oil sprays for the Control of the Winter Eggs of Paratetranychus 
pilosus. (15 min.) (Lantern). C. C. Hamilton, College Park, Md. 
23. Four Year Experiments on the Control of the Red Spider 
(Paratetranychus pilosus. (10 min.) S. W. Frost, Arendtsville, Pa. 
Dormant and Summer applications with dusts and sprays for the control of Red 
Spider. 
Adjournment. 
