...It consists of a central stem orstalk, probably hollow, or, at least, porous, possessing asemi-transparency, not found in the fibre of hair... 
Robert Jennings 「Sheep, Swine, and Poultry」
...The peninsula is composed almost wholly of a bed of coraline and porous limestone covered with a layer of thin, dry soil formed from the slow weathering of the bedrock...
Erwin E. Klaas 「Summer Birds From the Yucatan Peninsula」
...A protective rind, a kind of solidified foam, envelops this core, exceptat the top, along the central line, where the porous rind is replaced bythin overlapping leaves...
J. H. Fabre Bernard Miall 「Social Life in the Insect World」
...They are of a porous bony texture covered with short, coarse bristles...
Mayne Reid 「The Giraffe Hunters」
...Slipper-form vessels are always of coarseware for the obvious reason that, being somewhat more porous, they aremore readily heated than polished utensils...
Jesse Walter Fewkes 「Archeological Expedition to Arizona in 1895」
...So these bricks, being of thislight and porous quality, and admitting no moisture into their texture,must by the laws of nature float in water, like pumice, no matter whattheir weight may be...
Vitruvius 「Ten Books on Architecture」
...This is because the lime, having had itsmoisture burned out in the kiln, becomes porous and loses its strength,and its dryness makes it take up anything that may come in contact withit...
Vitruvius 「Ten Books on Architecture」
...After thisis dry, the gum is washed off as far as may be with water; some ofthe gum is left in the porous stone, but it is rejected where thegreasy lines and tones of the drawing come...
Harold Speed 「The Practice and Science Of Drawing」
...Formerly thissurface usually, if not always, received a priming coat, and it doesso still where the surface is coarse, uneven, rough, and porous...
William N. Brown 「Handbook on Japanning: 2nd Edition」
..."Thatso-called jaw-bone was a lump of chalk, made porous by water, and therest was in your imagination...
Victor Rousseau 「Astounding Stories of Super-Science January 1930」
...Naked, gray porous rock everywhere...
Various 「Astounding Stories of Super-Science April 1930」
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