. Carnegie Institution of Washington publication. COLLOIDAL METALS. 51 liquid glass. The sulphuric acid is more transparent than water, while the didymium nitrate has a sharp absorption band at 0.76 ft. The latter. 90% 1.7,U Fig. 33. — Potassium alum (a); Borax solution (b); Water (c); Potassium permanganate solution.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Carnegie Institution of Washington. Washington, Carnegie I

. Carnegie Institution of Washington publication. COLLOIDAL METALS. 51 liquid glass. The sulphuric acid is more transparent than water, while the didymium nitrate has a sharp absorption band at 0.76 ft. The latter. 90% 1.7,U Fig. 33. — Potassium alum (a); Borax solution (b); Water (c); Potassium permanganate solution.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Carnegie Institution of Washington. Washington, Carnegie I Stock Photo

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. Carnegie Institution of Washington publication. COLLOIDAL METALS. 51 liquid glass. The sulphuric acid is more transparent than water, while the didymium nitrate has a sharp absorption band at 0.76 ft. The latter. 90% 1.7, U Fig. 33. — Potassium alum (a); Borax solution (b); Water (c); Potassium permanganate solution.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Carnegie Institution of Washington. Washington, Carnegie Institution of Washington

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RMRFT2W0–. Carnegie Institution of Washington publication. Imbibition and Growth of Opuntia. 137 The size or swelling of any colloidal mass, such as a growing organ, or particularly a joint of Opuntia, will depend upon the integrated effects of several agencies, including transpiration, absorption, the hydration coefficient (as determined by the acid, salt, and protein content of the protoplasm), and the temperature. Several series ef measurements of the separate processes involved have been made at the Desert Laboratory. The earliest results of importance with reference to transpiration as affecting g

RMRFWB5G–. Carnegie Institution of Washington publication. PREFACE. V Finally, in Chapter VI, I return to the problem begun in Chapter I, to see whether there is any change in the colloidal nucleation of dust- free air, such as might be ascribed to the ionization produced by some penetrating cosmical radiations coming from without; for it was to be the plan of these researches to study the ordinary dust content of the atmosphere with regard to its variation in the lapse of time first, and thereafter to continue in the same way with the nucleation of the dust- free atmosphere. This nucleation is found t

RMRFR8A6–. Carnegie Institution of Washington publication. 52 EXPERIMENTAL STUDIES ON FETAL ABSORPTION. comes in contact with the maternal tissue of the uterine wall. Goldmann showed that in the mouse this layer of cells plays an important role, similar to that of chorionic epithelium, in the transmission of nutritive material from mother to fetus. The endodermal cells have an enormous capacity for storing colloidal material. They, as well as the chorionic epithelium of the placenta, are responsible for the failure of foreign colloids, injected into the maternal blood-stream, to enter the fetus (figs.

RMRFRTCN–. Carnegie Institution of Washington publication. i6 CONDENSATION OF VAPOR AS INDUCED BY NUCLEI AND IONS. I purpose, therefore, in the present paper, to study the same phenom- enon for an artificial barometer; in other words, to accentuate the present discrepancies, let the pressure drop from a given upper limit to varying lower limits, as well as from varying upper limits to a given lower limit. The results so obtained are enormously different for the same drop of pressure. Much of this would be anticipated; but the question nevertheless arises whether the colloidal nucleation of the gas is a

RMRFRM2X–. Carnegie Institution of Washington publication. 16 DEVELOPMENT OF CEREBRO-SPINAL SPACES IN PIG AND IN MAN. by Evans^14') phagocyte the small colloidal particles. In addition, the true solution must be readily precipitated as an insoluble salt, capable of remaining unchanged in histological technique. After trying many salts in long-continued injections into the adult cerebro-spinal spaces, it was found that solutions of potassium ferro- cyanide and iron-ammonium citrate in equal parts were admirably adapted to the purposes of the experiment. By the addition of a mineral acid (preferably hydr

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$. Carnegie Institution of Washington publication. COLLOIDAL METALS. 53 normal silver in a finely divided state, little if any being in true solution (molecularly subdivided). He further concludes that the color of ruby gold glass is due primarily to the presence of small spheres of gold; the irregular blue and purple colors, sometimes exhibited by gold glass, are then explained by the presence of crystallites (caused by the coagulation of gold spheres) which reflect but do not transmit red light. 100% 90 80 70 60 C o if) 50 'e It) 30 20 10 d^ {Au (Colloidal). Please note that these images are Stock Photo$

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RMRFRT1R–. Carnegie Institution of Washington publication. . 0 .5 / 2 3 Fig. 36. — Gold; Silver; Nickel. In view of the fact that colloidal metals appear to behave exactly the reverse of films of a metal in the normal state, the subject deserves further consideration. Gold and Nickel. In fig. 36, curve a gives the transmission (Hagen and Rubens, loc. cit.) of a metallic film of gold, which has the well-known transmission band in the yellowish-green part of the spectrum. Curves c and d give the trans- mission of suspensions, in water, of colloidal gold and nickel, respectively, studied photometrically b

RMRFRJD5–. Carnegie Institution of Washington publication. The Absorption Coefficient of Solution for Monochromatic Radiation. 33 a colloid condition. They showed slightly a Tyndall cone in blue light. An examination of these freshly filtered iso-butyl alcohol (and also the iso-amyl alcohol) solutions with the ultra-microscope showed that they were not colloidal in nature, but that they contained a number of particles. Whether these particles were newly formed precipitate or some impurity is unknown. 1133//# •734 .194 CoCI2in Iso-butyl alcohol. 800 900 1,000 1,100 1,200 1,300/4^ FIG. 9.—The A-c and Abs

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RMRFRW3Y–. Carnegie Institution of Washington publication. n8 VAPOR NUCLEI AND IONS.. 10 iz 14 is ib ao ^^ ^4 ^6 aa 30 Fig. 55.—Aperture of coronas (s), observed at different exhaustions (dp), in media of alcohol-air, water-air, energized or non-energized. Table 46. I4C0 1200 ICOO BOO 600 400 ZOO 10 IZ 14 16 18 ZO ZZ Z4 Z6 Z8 30 32 34 36 38 Fig. 56.—Efficient nucleation n in energized or non-energized media of alcohol-air and water-air, at different exhaustions {dp). Table 46. the saturated vapor which furnishes the colloidal nuclei and that the gas is only secondarily involved. 81. Data for alcohol va