. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. DOSAGE SCHEDULES OF MOEE IMPOKTANT WRITERS. 19 in excess of 20 ounces in a 2-gallon generator, the contents will fre- quently boil over, especially if the cyanid is in small lumps or is powdered. DOSAGE SCHEDULES OF THE MORE IMPORTANT WRITERS ON FUMIGATION. Since the publication by Morse, in 1887, of the first dosage schedule for use in fumigating citrus trees with hydrocyanic-acid gas, a great many tables of dosage have been re c ommend e d through publica- tions in this coun- try and abroad. Among the more auth
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. DOSAGE SCHEDULES OF MOEE IMPOKTANT WRITERS. 19 in excess of 20 ounces in a 2-gallon generator, the contents will fre- quently boil over, especially if the cyanid is in small lumps or is powdered. DOSAGE SCHEDULES OF THE MORE IMPORTANT WRITERS ON FUMIGATION. Since the publication by Morse, in 1887, of the first dosage schedule for use in fumigating citrus trees with hydrocyanic-acid gas, a great many tables of dosage have been re c ommend e d through publica- tions in this coun- try and abroad. Among the more authoritative contributions on this subject are those of Coquil- lett, Morse, Craw, Marlatt, Johnson, Havens, Wood- worth, Pease, and Morrill, of this country; C. P. Lounsbury, of South Africa, and W. J. Allen, of New South Wales. A careful study has been made of the dosage sched- ules proposed by these different in- vestigators with a result most surprising. In the first place, we must consider that uniform dosage will not be given to trees unless based directly on their cubic contents when covered with a tent. Secondly, dosage tables prepared for trees merely with regard to their cubic contents and without regard to the varying pro- portions of leakage surface present in trees of different sizes are faulty to a large degree. Of all the dosage tables which have come to the writer's attention only those by Lounsbury, in South Africa, by Morrill, in Florida, and a recent one by Woodworth in California, have been based on the proper assumptions. The other tables were either based directly on the cubic contents without regard to leakage surface, or were prepared without any knowledge whatever of the cubic contents represented by trees of given dimensions. Several. Fig. '.I.—Man carrying tray and water bucket. (Original.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these ill
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