Page:Proceedings of the Royal Society of London Vol 60.djvu/116

Rh Table II.

Series of Number of observa- observations. tions. rn /r\.

A rc/rA. A ro/^A- A __ ........ Max. Min. Mean. ' ^ Max. Min. Mean. -\ Max. Min. Mean. i. 25 0-38 0*17 0-26 3 05 I ’l l 2-22 3-33 1-46 2-41 i i. 45 0*54 0-16 0-29 2-32 1-40 1-78 4-52 1-46 2-28 i n. 31 0*50 0-17 0-27 2-29 1-00 1-70 3-67 1*11 2-14 IY. 23 0-41 0*09 0-22 2-86 1-33 1-92 —— —— Series of Number of observa­ observations. tions. rg jrx. n?/rA.

Max. Min. Mean. Max. Min. Mean. i. 25 4*95 2*46 3-12 — — — i i. 45 6-30 1-74 2-68 — — — h i. 31 4-33 1-11 2*51 — — — IY. 23 4-73 2-05 2*87 8*34 2*71 4 53

In series I there were only twelve observations at station E. In series III the mean ratios for the higher stations are depressed by one abnormally low reading. The means in the different series vary, bnt the differences are too small to warrant any positive conclusion. They indeed suggest the possibility of the potentials at the higher stations being relatively somewhat higher in winter than in summer, but this may arise from a slight want of uniformity in the procedure followed at the different seasons. The departures of the maxima and minima in Table II from the means are considerable, but the number of instances in which the departures from the mean are large is in reality small. This will bo seen by reference to Table III, which gives the percentage deviations of the ratios from their means, treating each series of observations separately.

Table III.

Percentage Deviations from the Means. 1 Series of observations. rjilrx. rc/rA. ro lrx. »*e /rA. rF/rA. i. 14 14 15 15 ____ ii. 19 10 19 21 — m. 19 11 20 20 — 1 i v - 28 13 16 20