( 57 ) 
their height of the Mercury and that at London • You 
would alio Oblige me in procuring me fome Ohferva- 
tions of the Baromerer, made this jail Year st London 
where there was fo much Rain^for the moft part of the 
Summer, and here fo little; as you will find by the Paper 
I have fent you, and fo great a Droughty that we have 
not above half the Proportion of Hay that lefs dry^ 
Summers uled to afford us ; for if fometimes the diffe- 
rent heights of the Mercurial Standards vary much, pro- 
bably 'twas about that time; though I am tx)div^ 
they do not alter, except it be in very hot and cold 
Weather, when the weight of the fame Cylinder of 
Air may much vary in its weight, as well as rarity and 
denfity : But in confirmation of what I have faid above, 
I fuppofe you may not be difpleafed with two Remark^ 
able Obfervations, made both by l^t.FlamJlead and me 
at the fame time, 'jy/z. Novemh.iZth, i6y^, when find- 
ing the Mercury to defcend both very faft and very low, 
we watch'd it very nicely, and both of us obferved that 
at Two in the Afternoon it was rather falling, and ra- 
ther fifing at Four ; at which times the height was only 
here i7[63 Inches, and at London f^ths higher. 
the TAB L E of Rain. 
\ftbr. 
March 
April 
May 
Junt 
July 
Aug. 
\oaob. 
Dec. 
1677 I 7^ 
37J 
371 
250 
170 
581 
257 
339 
H5 
527 
644: 
555 
057 
472 
270 
325 
313 
516 
351 
485 
223 
333 
432 
400 
Sum 43651426'- 
79 I 80 I 81 
"^43 5i2.| 053 
i6i\ 492 363 
202! 413 235 
092 222 1 057 
105' 188' 069 
^98; 34^1 3.97 
350' 302 292 
835! 502' 425 
5531 14^, ^^7 
6i6\ 570 j 170 
127! 479; 235 
439 269 423 
;82i 4428 3326 
032 
483 
0S7 
04: 
18' 
5o66!37i6 
370' 3bc 
OQjl 201 
192 41 C 
313 49- 
338 39^ 
199 163 
415 325 
5791 522 
2Qg! 54S 
1414i378i 
86 1 
472 
020 i 
572 
305 
437 
473 
188 
O'JO 
^93 
709 
5^H3 
Sum ! 
3^89; 
25S2 
2731 
263 f 
2659 
3870 
352<5 
4965 
3435 
4'33 
4355 
3051 
f68.7 
