418 
DR. E, J. SALISBURY ON 
Tagze II. 
THE 
Average Organic Content (=Corrected Loss on [gnition) of Soils 
k : 
and Wormcasts. 
Locatio | Organic Content | Organice Content | Difference 
Dean. | of Soil (0-2 in.). | of Wormeasts. W-S. 
| il 
Festuca- Agrostis. Society ........ | 13:18 per cent. | 17:24 per cent. +411 
Polytrichum-Agrostis. p  ........ | 1950 ,  ,, 17°08 4, » — 253 
Calluna-Triodia, gy vee 1755 , y 92:45 4  , +490 
Colney Heath. Loc. À .......... S82 4, oy 13:90 , y +508 
» " Loc. B ..........) 1217 4, yy 1598 , 5 +5381 
Hertford Heath, Loe. A .......... 9:5l , , 980 , 4, +0'29 
» » Loc. B .......... 1142 , ,, 972 a 4 | —170 
Quercus Robur- Corylus. Wood .... TTO ,, ,, 830 , 4, | +0°60 
TABLE III. 
Effect of Earthworms on the Hydrogen-[on Concentration 
yarog 
of the Soil. 
| 
| 
Av. pH Av. pH | Differ- 
Locality. Vegetation. of Worm- | „erce 
Soil. casts. W-S 
Ilarpenden, Festuea- Agrostis (Loc. A) ...... 5l 57 +0°6 
» Calluna- Triodia voce eee 51 54 +08 
Radlett. Quercus Robur-Corylus ........ 52 56 | +04 
Harpenden. 'estuca- Agrostis (Loc. B) ...... 527 584 +0°57 
Radlett. Q. Robur-Corylus........,,,,.. 56 6:35 40775 
Colney Heath. Nardetum ................,... 57 64 +07 
Harpenden. Polytrichum-Agrostis (Loc. B) .. 573 593 +02 
Surrey, Q. sessiliflora  ,.,,....,,...... | 58 6:25 +045 
Colney Heath. Pasture ......,.......,...,... 6:0 6:8 +03 
Hertford Heath. Boe] hee ehh s 62 6:4 +02 
Holmwood Common, Hose e mehr G2 6:43 +023 
Harpenden. Polytrichum-Agrostis (Loc. A) . 6:3 67 +04 
Radlett. Q. Robur-Corylus. n.s... u.a.. 65 68 +03 
Markyate. Serub cc. ee cee eee eee 6:0 6:85 | —0:05 
vadlett, Q. Robur- Corylus... s.s... 6:0 68 | —01 
Harpenden. Chalk pasture ......,,...,.... (024 1:27 | +0:08 
Munden. Alluvial meadow ...........0-. 145 T33 | — O12 
Burton’s Down, Surrey. Chalk pasture ..........,,.... 745 | 735 | —01 
Range of pH of Soils pH ^1-pH 7:45. 
Range of pH of Wormcasts pH 54-pH 7:35. 
Range of difference 
— 0:12 to + 075. 
