. Bulletin. Natural history; Natural history. 227 The experiments were carried on in three series, kept as nearly independent as possible so that each would serve as a check on the others. I shall designate them as the large-cage series, the life-history series, and the band-record Fi(i. 4. Two oviposition cages in place on tree. LARGE-CAGE SERIES Cages used in this series were large enough to cover entire trees, the largest cages being 18 feet square and 18 feet high, (Fig. 5, 6, and 7.) The plan was to use two cages each for the first and the second genera- tions and one cage for th
. Bulletin. Natural history; Natural history. 227 The experiments were carried on in three series, kept as nearly independent as possible so that each would serve as a check on the others. I shall designate them as the large-cage series, the life-history series, and the band-record Fi(i. 4. Two oviposition cages in place on tree. LARGE-CAGE SERIES Cages used in this series were large enough to cover entire trees, the largest cages being 18 feet square and 18 feet high, (Fig. 5, 6, and 7.) The plan was to use two cages each for the first and the second genera- tions and one cage for the third generation—if a third generation appeared. The framework of the cages, consisting of 2X4 scantling, was erected over the trees before they were in bloom, and wire cloth, 12 wires to the inch, was tacked over the frame as soon as the time of full bloom was past. Each of the cages had a tight-fitting screen-door provided with hasp and padlock. The trees thus screened in were exantined very carefulh' for larvae and two inches of the soil in each cage was removed. The first moths to emerge from the hibernating larvje were placed in cage No. 1, and the last moths to emerge in cage No. 2, to rear the first and the last individuals of the first generation; the first moths reared. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
