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Updated: May 15, 2025
And subsequently, when there is reason to suppose that the land requires a fresh supply of phosphoric acid, an application of bone-meal may again be used.
Bonedust should be mixed with fine top soil, and then applied to the land, or it may be mixed with cattle manure, or applied as a surface dressing, but either of the two first-named methods of application is to be preferred. In 500 lbs. of bones there are, in round numbers, about 250 lbs. of phosphate of lime, which consists of 125 lbs. of phosphoric acid and as many of lime.
Then I went below for the telescope, and spent nearly ten minutes of the utmost impatience in vainly trying to get a focus, and in rubbing the skin nearly off my eyes, before I discovered that having taken off the large glass to examine the phosphoric water with I had omitted to put it on again.
Now as regards the chemical aspect of the manurial question, if we assume, as we have every reason to do from the small quantity of potash required, and its supply from decomposing stones in the land, that the potash does not require to be taken into account, we shall find that our nitrogen and phosphoric acid can be far more cheaply supplied by fish, or by a mixture of bone-meal and oil-cake than by farmyard manure, and should it be found that potash does require to be added, we could obtain it more cheaply from ashes or kainit.
This place pleased him more than any he had visited. He liked to wander about among the massive granite pillars of that noble ecclesiastical fortress, and at night to watch the phosphoric tide come rushing in with all the speed of a race-horse, over the wide sands, which separate it from the mainland.
Soon the whole sky from east to north seemed supported by a phosphoric band of intense brilliancy. This kept increasing by degrees till it overspread the entire horizon, kindling the clouds which were faithfully mirrored in the waters as if they were masses of combustible material, beneath, and presented the appearance of an immense globe of fire, the center of which was the OMBU.
Now and then a red and fiery star would whiz crackling through the air, and then exploding break into numerous pale phosphoric lights, that danced awhile overhead, and then flitted away among the ruins. The ground seemed to heave and tremble beneath the footsteps, as if the graves were opening to give forth their dead, while toads and hissing reptiles crept forth.
I have pointed out that phosphoric acid is retained by the soil, and it is important to remember that it is only removed by the crops of coffee to the extent of from one-and-a-half to two pounds per acre per annum, and these are two facts that every planter should bear in mind when he contemplates following the common custom of manuring with bones.
He paces and repaces the deck, now gazing vacantly in the direction the ship is steering, then walking to the stern and watching the long train of phosphoric light playing on the toppling waves. There was something evasive in the manner of the man who communicated to him the intelligence concerning McArthur.
The phenomenon of phosphorescence is most conspicuous on stacks of fire-wood. It is no exaggeration to say that one does not need to move from the fireside to see this phenomenon, for if there is a partially decayed log amongst the fire-wood, it is almost sure to glow with a pale phosphoric light. I have reason to believe that it spreads with great rapidity from old surfaces to freshly cut ones.
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