percolationn.

1612 J. Cotta Short Discouerie Dangers Ignorant Practisers Physicke ii. iv. 105 The thinne aquositie oft onely issueth by so straight a percolation, as can carrie no signe.

1626 F. Bacon Sylua Syluarum §3 It seemeth Percolation or Transmission, (which is commonly called Straining) is a good kinde of Separation, Not onely of Thick from Thin..But of more subtile Natures.

1705 C. Purshall Ess. Mechanism Macrocosm 85 By divers Percolations, and Subtilizations, to get their specifying Parts for the Meliorating of Mettals.

1799 Med. & Physical Jrnl. 1 402 The..utility of Mr. Collier's new machines for percolation.

1822 T. Taylor tr. Apuleius Metamorphosis 207 She defecates, by percolation, the precious wine.

1885 C. G. W. Lock Workshop Receipts 4th Ser. 198/1 Percolation..is a kind of filtration, commonly called ‘by displacement’, employed for extracting the essence from roots, herbs, seeds, barks, &c.

1922 Amer. Jrnl. Bot. 9 348 Forty-two grams of substrate yielded 10.86 grams dry weight of material for percolation.

1952 New Phytologist 51 304 The whole sample was used in each percolation.

1996 Ann. Missouri Bot. Garden 83 530/1 Dried plant materials were processed by percolation in a 1:1 mixture of methylene chloride : methanol.

1613 S. Purchas Pilgrimage v. xiii. 512 This freshnesse of the springes..may rather be ascribed to percolation and strayning through the narrow spongie passages of the earth.

1646 Sir T. Browne Pseudodoxia Epidemica ii. i. 56 Petrifications, or Minerall indurations, like other gemmes proceeding from percolations of the earth disposed unto such concretions. View more context for this quotation

1799 R. Kirwan Geol. Ess. 378 Dense strata of clay..alone could detain the sea water, and prevent its percolation.

1841 T. R. Jones Gen. Outl. Animal Kingdom xv. §311. 269 The chyle or nutritive material extracted by the food, exudes..by a species of percolation through the walls of the intestine.

1863 J. D. Dana Man. Geol. 662 The waters..reach the ocean only by percolation through the beach.

1939 E. D. Laborde tr. E. de Martonne Shorter Physical Geogr. (rev. ed.) ix. 129 In ground where the rock is permeable, percolation takes place freely and feeds the stores of underground water.

1983 Garden Design Autumn 60/1 Natural percolation is very slow, as attested by the bog vegetation.

2003 San Diego Union-Tribune (Nexis) 27 Apr. n1 It will be recharged by surface percolation through the soil, which provides another barrier to viruses.

1660 Bp. J. Taylor Ductor Dubitantium I. ii. ii. 285 If we list to observe that..Pythagoras..and Socrates had great Names amongst the leading Christians, it is no wonder if in the percolation something of the relish should remain.

1669 S. Lee Contempl. Mortality 30 Though they passe not through the strainer of the grave, yet they undergo the percolation of a change.

1855 U.S. Rev. Mar. 175 In the moral world, it is by the gradual infusion and slow percolation of great truths, that the whole ‘age and body of the time’ is permeated.

1873 Daily News 27 Aug. 5/2 People grow weary of waiting for the slow percolation of that doctrine through the official mind.

1934 Brit. Jrnl. Psychol. July 24 An ‘upward’ percolation of population must be taking place.

1992 J. Weeks Sex, Polit. & Society (BNC) 69 Many working-class radicals saw the percolation downward of birth-control methods as a sign that aristocratic decadence was spreading.

1668 Bp. J. Wilkins Ess. Real Char. iii. x. 361 Percolation of the breath betwixt both the Lips contracted round-wise which makes the vocal whistling sound.

1711 J. Greenwood Ess. Pract. Eng. Gram. 254 Letters framed by a percolation or straining of the Breath through a kind of Chink betwixt the Tongue and upper Teeth.

1957 S. R. Broadbent & J. M. Hammersley in Proc. Cambr. Philos. Soc. 53 629 It may be natural to ascribe the random mechanism either to the fluid or to the medium. Most mathematical analyses are confined to the former alternative, for which we retain the usual name of diffusion process: in contrast, there is..little published work on the latter alternative, which we shall call a percolation process.]

1961 Jrnl. Soc. Industr. & Appl. Math. 9 537 The random plane network problem strongly resembles a percolation problem. Unfortunately the two are enough different that the theorems of percolation theory do not apply directly.

1987 A. Aharony in G. Busiello et al. Internat. Meeting Adv. on Phase Transitions 186 The percolation model is widely used to describe alloys of materials with different properties, e.g. metal-insulator, magnet-non-magnet, etc.

1998 Jrnl. Ecol. 86 647 Models based on percolation theory and computer simulations suggest that, as the proportion of suitable habitat decreases, the effects of habitat loss on population persistence are amplified.

2003 T. F. H. Allen et al. Supply-side Sustainability v. 312 Percolation theory applies to engineering issues, such as when expensive gold is used to transmit electricity across the surface of nonconductive material. Percolation theory tells the engineer how little gold can be used and still conduct electricity.

1899 J. Cagney tr. R. von Jaksch Clin. Diagnosis (ed. 4) i. 94 The greater ease with which watery blood neutralises the acid..in the percolation tests.

1939 F. B. Wright Rural Water Supply & Sanitation ii. vii. 268 If there is doubt relative to soil conditions, the lengths of tile to be provided should be determined by the percolation test described below.

1978 Jrnl. Biomed. Materials Res. 12 149 Penetration of fuchsin into the sealant-enamel interface during a percolation test was not observed.

2001 S. Roaf et al. Ecohouse (2002) x. 223 Your local professional engineer can do a percolation test to determine the ability of the ground to accept water.