346 MR. T. W. WOODHEAD ON THE 
Maximum and minimum temperatures recorded at 9 A.M. 
One foot below the grass.* 
1902. 1903. 
June. July. Aug. Sept. Oct. Nov. Dec. | Jan. Feb. Mar. Apr. May. 
607 601 562 57:2 51-2 478 432 | 408 435 447 448 536 Max. 
497 540 531 505 463 387 360 345 377 386 392 458 Min. 
110 61 31 67 49 91 72) 63 58 61 56 98Dif. 
Maximum and minimum temperatures recorded at 9 A.M. 
Two feet below the grass.* 
59:0 587 555 559 51:3 479 435 | 405 435 442 445 524 Max. 
492 530 53:4 512 473 407 380 | 357 387 396 408 446 Min. 
98 48 21 47 40 72 55 48 48 46 37 78 Diff. 
For purposes of comparison, woods in other parts of the 
district were examined and similar maps prepared on the same 
scale; these were Molly Carr Woods and Haigh Spring Wood 
in the Coal-Measure Area, and Armitage Bridge Woods, Honley 
Woods, and Hagg Wood, on the edge of the Millstone-Grit 
Plateau. These gave the same results, except that in some areas 
indicated as Sandstone on the Geological Map it was found, on 
examining the soils, that these beds were overlaid in great part 
by moist clayey loam and considerable humus, and not by a dry 
sandy soil asin Birks Wood. The trees, too, in these parts of 
the woods are frequently shade-trees, hence in areas which from a 
Geological map might be expected to produce xerophytic grasses 
and their associates, the ground was dominated by mesophytes. 
These features occur not uncommonly throughout the Coal- 
Measure area. The detailed study, even of a small area, 
shows the importance, not only of the edaphic influences in 
determining the composition of the flora, but also that the 
distribution of the dominant species is the result of many 
interacting and complex forces. 
* These do not represent absolute Maxima and Minima; the readings are 
taken at 9 a.m., which is the coldest hour of the day for Earth Temperatures. 
In the six summer months the absolute Maxima are perhaps one or two 
degrees higher; the Minima are probably not far from absolute Minima. In 
some respects the results are unusual. February and March were both very 
mild months, and April was abnormally cold, so that it was actually a trifle 
colder than both the preceding months. 
