Archive image from page 161 of Dairy farming being the. Dairy farming : being the theory, practice, and methods of dairying dairyfarmingbein00shel Year: 1880 100 DAIRY FARMIXG. :iriil, iiiul to ivnu'mhcr that the deeper sucli water percolates ilowuwanls, the more saturated with dissolved carhouates will it Ijecome, and therefore '.' - â .'-'z â ' -. â . '.'â >'.'â â 'â ~/o; â ..;â â . :â '. B- '.â â ', 'â .. '-'SUBSOI L â -'â¢';â ; .V-'- the less eapaLlo of effecting' further solution of rock-substance. The surface soil will contain the silica and alumina which were present in the imj
Archive image from page 161 of Dairy farming being the. Dairy farming : being the theory, practice, and methods of dairying dairyfarmingbein00shel Year: 1880 100 DAIRY FARMIXG. :iriil, iiiul to ivnu'mhcr that the deeper sucli water percolates ilowuwanls, the more saturated with dissolved carhouates will it Ijecome, and therefore '.' - â .'-'z â ' -. â . '.'â >'.'â â 'â ~/o; â ..;â â . :â '. B- '.â â ', 'â .. '-'SUBSOI L â -'â¢';â ; .V-'- the less eapaLlo of effecting' further solution of rock-substance. The surface soil will contain the silica and alumina which were present in the imjiure limestone, some undissolved carbonate of hme, and humus. Very low forms of vegetable life, such as lichens, and then mosses, first appear on a young soil, and these disturb its chemical composition; thus, lichens which grow on limestone yield on analysis oxalate of lime. The decay of such low plants gradually confers on the soil a small amount of humus, and so it is slowly prepared for the growth and nutrition of other plants higher in the scale. It now only remains to indicate briefly the characters of the soils derived from the various formations, and these will be taken in the chrono- logical order in which they are tabulated on page 97, commencing with the oldest, the igneous rocks being first dealt with. The reader should keep constantly before him the accom- panying geological map of the British Isles, which we have endeavoured to make as accurate as possible. Many geographical details have been given, but as the map had to be constructed on a sufficiently small scale to be uniform with the rest of the work, such particulars as rivers, railways, and divisions into counties have, to avoid comijlication, been omitted. As these, however, may be seen on any ordinary map. tlieir position on tjie geological map may be determined without much difticulty. Igseoi's Rocks.âGranite soils owe wliat fertility they may possess to the decomposal)le nature of the
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