----------------------++---------------------- 1/2 A. || 1/2 B. ------------+---------++------------+--------- Number of | Seconds || Number of | Seconds pulsations | of rest || pulsations | or rest ------------+---------++------------+--------- 2 | 363 || 50 | 20 12 | 362 || 81 | 25 4 | 666 || 37 | 101 25 | 300 || 2400 | 60 ------------+---------++------------+--------- But although in the case of Sarsia the leaser endurance of the smaller segment than of the larger cannot be regarded as a general rule, it may be so regarded, as already stated, in the case of Aurelia. The following experiment exemplifies this particular rule even more prettily than does the one quoted in the text, from the fact that the segments survived the operation for a greater number of days. An Aurelia having a regular and well-sustained rhythm of twenty per minute was divided as already described in the text. In five-minute intervals on successive days the average rates of the four segments were as follows:-- Four hours after the operation. -----------+-----------+-----------+------------- Seg. 1/2. | Seg. 1/4. | Seg. 1/8. | Seg. 1/8 A. -----------+-----------+-----------+------------- 100 | 100 | 85 | 90 -----------+-----------+-----------+------------- Next day. -----------+-----------+-----------+------------- 88 | 90 | 64 | 58 -----------+-----------+-----------+------------- Next Day. -----------+-----------+-----------+------------- 86 | 82 | 62 | 57 -----------+-----------+-----------+------------- Next Day. -----------+-----------+-----------+------------- 59 | 45 | 24 | 20 -----------+-----------+-----------+------------- Next day. -----------+-----------+-----------+------------- 50 | 49 | 20 | 10 -----------+-----------+-----------+------------- Next day. -----------+-----------+-----------+------------- 43 | 33 | 18 | 4 -----------+-----------+-----------+------------- Next Day. -----------+-----------+-----------+------------- 39 | 32 | 19 | Dead. -----------+-----------+-----------+------------- Next day. -----------+-----------+-----------+------------- Seg. 1/2. | Seg. 1/4. | Seg. 1/8. | Seg. 1/8 A. -----------+-----------+-----------+------------- 33 | 7 | Dead. | 0 -----------+-----------+-----------+------------- Next day. -----------+-----------+-----------+------------- 28 | Dead. | 0 | 0 -----------+-----------+-----------+-------------