. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 146 JOHN BUCK AND MARGARET KEISTER. 4 HOURS FIGURE 1. Typical records of CO- release rate in Agapcma (A) and Rothschildia (B), showing CO2 bursts; 2S°. from individuals giving small bursts every half hour or so to those giving large bursts at longer than 8-hour intervals. The particular 1953 figures used in Table I cover a period of only a few weeks; later, after various experiments had been run, there had been marked increases in burst frequency in some individuals, several giving bursts as often as every hour, whereas in a
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 146 JOHN BUCK AND MARGARET KEISTER. 4 HOURS FIGURE 1. Typical records of CO- release rate in Agapcma (A) and Rothschildia (B), showing CO2 bursts; 2S°. from individuals giving small bursts every half hour or so to those giving large bursts at longer than 8-hour intervals. The particular 1953 figures used in Table I cover a period of only a few weeks; later, after various experiments had been run, there had been marked increases in burst frequency in some individuals, several giving bursts as often as every hour, whereas in a few pupae there was a decrease in mean frequency. The 1954 figures involve a longer time span, but in spite of this there was a much larger proportion of long-period pupae than in 1953. TABLE I Number of pupae of given mean CO* release cycle length at 25° Total no. Mean cumu- Cycle lengths in hours pupae obs. per pupa* 1-2 2-3 3-4 4-5 5-6 6 + 1953 35 46 0 3 13 17 2 1954 89 47 3 5 3 11 5 60 2 * Ranging from 8-120 hours per individual, but mostly from 20-60 (, the standard devia- tion for the 1954 pupae was hours). Cycle variation within a given pupa during a period of continuous measure- ment is indicated by the data for burst volume and cycle length in Table II. For rough comparison with Schneiderman and Williams' data on the pupa of the Cecropia moth, Platysamia, Table III gives the variables of the CO2 burst cycle in a number of multiple-burst pupae for which corresponding O, uptake records were available. From this it appears that Agapcma pupae differ from those of Platysamia in having bursts which are briefer and represent only 16-36 times the volume of CO2 released continuously in an equal (10 minute) period (rather than up to more than 200-fold) and in releasing only 45-65% of their CO2 production per cycle as bursts (rather than up to 95%)- ranging from to are. Please note that these images are extracted from scanned page images that may have be
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