Page:Transactions of the Natural History Society of Northumberland, Durham, and Newcastle-upon-Tyne (1867).djvu/68

50 we have added for comparison the figures for York, Greenwich, and Helston during the same period.

Reckoning by seasons instead of months, taking December, January, and February as winter, and the others in order from this as a starting point, we obtain the following result:—

In the first place, comparing Bywell with Allenheads, we see that the difference, season by season, is 4.7, 4.7, 4.5, and 4.8 for a difference in level of 1300 feet, which quite bears out what we said before, that to speak in round numbers, we may reckon that