--------------------------+--------------------------------- _Sarsia._ | _Sarsia_ (another specimen). -------------+------------+--------------+------------------ Number of | Seconds of | Number of | Seconds of pulsations. | rest. | pulsations. | rest. -------------+------------+--------------+------------------ 54 | 90 | 40 | 60 20 | 15 | 29 | 90 9 | 92 | 32 | 132 51 | 40 | 33 | 92 38 | 60 | 18 | 59 1 | 43 | 8 | 63 63 | 45 | 15 | 35 1 | 14 | 2 | 85 60 | 15 | 11 | 63 6 | 50 | 30 | 33 38 | 50 | 17 | 81 22 | 32 | 19 | 67 25 | 12 | 3 | 65 56 | 55 | 19 | 36 65 | 20 | 41 | 123 42 | 15 | 80 | 23 35 | 40 | 61 | 150 76 | 43 | 45 | 145 | | 40 | 120 | | 10 | 97 | | 14 | 35 -------------+------------+--------------+------------------ These observations may be taken as samples of others which it would be unnecessary to quote, as it will be seen from the above that there is no precise relation between the number of the pulsations and the duration of the pauses. Nevertheless, that there is a general relation may be seen from some cases in which unusually prolonged pauses occur. The following instance will serve to show this:-- _Sarsia_ (another specimen). Number of pulsations. | Seconds of rest. 38 | 30 22 | 35 49 | 40 30 | 45 46 | 20 2 | 15 24 | 380 112 | 20 45 | 185 894 | 30 6 | 45 4 | 140 2 | 185 30 | 210 200 | 60