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Updated: June 6, 2025
Beneath the POUZZOLANA a thin layer of humus contains fragments of pottery of Hellenic origin; which marks the close of the historic period, and covers over the mass of pumiceous tufa vomited out by the volcano. It was in this tufa, which is eight feet thick, that the first signs of buildings were discovered. Further excavation brought to light two houses with doors, windows, and bearing walls.
Any fresh excavation of cellar or cistern, or cut for road or railway, will show the characteristics of the humus layer. It may form only a gray film on the surface, or we may find it a layer a foot or more thick, dark, or even black, above, and growing gradually lighter in color as it passes by insensible gradations into the subsoil.
As a general rule, the nearer the orchard is to large bodies of water, the more likely one is to get a crop, as the temperature of the water prevents a too early budding out in the spring and delays killing autumn frosts. Generally speaking, a sandy, porous soil is best for peaches, but they may be raised on clay lands if provided with plenty of humus.
No water is found in this loam by digging or boring; but after passing through this secondary formation, the humus or soil of the primitive is reached the leaves and limbs of trees superincumbent on this indicating its character then the sand and gravel, and very soon water, as in other primitive formations.
Schubler found that in seventy-two hours thoroughly dried humus, which is capable of taking up twice its own weight of water in the liquid state, absorbed from the atmosphere only twelve per cent. of its weight of humidity; garden-earth five and one-fifth per cent. and ordinary cultivated soil two and one-third per cent.
Therefore, we should harrow a dry plowing as soon as practicable, but with particular reference to the moisture supply rather than to other forms of fertility. Straw for Humus. Do you consider straw good to plow under for humus, and which kind, wheat, oat, or barley straw, is best?
I have seen the sun do it every June in countless gardens where, out of this same humus and soft rains, his potency works the transmutation as if in a night. So on July days this father of transmuters melts in his crucible, of which the earth under our feet seems always the very bottom of the bowl, many ingredients, and distils from them this pure gold.
The auriferous clays of the Gold Coast are thinly covered with humus, and are not buried, as in Australia, by ten to thirty feet of unproductive top-drift. The whole, therefore, can be run through the sluices before we begin mining the underlying strata.
This earth forms the dark-colored, rich humus which almost everywhere covers the surface of the land with a fairly well-defined layer or mantle. Von Hensen placed two worms in a vessel eighteen inches in diameter, which was filled with sand, on which fallen leaves were strewed; and these were soon dragged into their burrows to a depth of three inches.
The soil is "slickens," on the Yuba river, and the weeds grew up last year in a crop of volunteer barley, which was hogged off. I expect to plow five inches deep, and calculate that the barley straw and weeds will contribute to the supply of humus, which is always deficient in most of our soils.
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