recently computed the remaining observations of our earth-thermometers here, 1d. prepared a new projection of all the obations from their beginning in 1837 to cir calamitous close last year—results ly confirmatory of thos have been obtained, but with more and immediate bearing on the wea before us.
The chief features undoubtedly ded: for the past thirty-nine years, after eliminating the more season: summer and winter, are Between 1837 and 1876 three great heat-waves from without, struck th earth; viz., the fi visitation may for in 1879'5, within limits of half in magnitude and certainty is, that the periods of minimum temp-cold, are not either ix, or anywhere near, the middle time between the crests of those three chronologically identified heat-waves, bat are comparatively close up to them on either side, at a distance of about a If, so that the next such cold end of the present yea not an agreeable pr political agitators are at this ti igst the colliers, striving to to decrease the out-put of coal at ry pit's-mouth. Being, therefore, quite willing, for the general good, to Suppose taken, T beg to send you a frst of plate 17 of the forthcoming observations of this Royal Observatory, and shall be very happy if you can bring out from the measures recorded there, any more comfortable view for the public at large.
Astronomer-Royal for Scotlar Royal Observatory, inburgh, Septembet 27, 1877.
Text read from the printed page and cleaned; old type leaves the occasional error.