scholarly journals XXV. An account of experiments on the influence of colloids upon crystalline form, and on movements observed in mixtures of colloids with crystalloids

1879 ◽  
Vol 29 (196-199) ◽  
pp. 238-246 ◽  
Keyword(s):  
Royal Society ◽  
Crystalline Form ◽  
Alcoholic Extract ◽  
Microscope Slide ◽  
Thin Glass

In the “Proceedings of the Royal Society” for 1866, Dr. Montgomery has recorded some very remarkable observations made by him on the behaviour of “myelin” when brought into contact with water. “Myelin” being a term of various applications, it is necessary to state that the substance indicated in Dr. Montgomery’s statement is an alcoholic extract of yolk of egg. A small quantity being placed on a microscope-slide, and covered with thin glass, is brought under observation by a tolerably high object-glass.

Royal Society: On Hendry's Crystals

1864 ◽  
Vol s2-4 (15) ◽  
pp. 241-246
Author(s):  
WILLIAM HENDRY
Keyword(s):  
Royal Society ◽  
Chemical Nature ◽  
Glass Slide ◽  
Thin Glass ◽  
Similar Treatment ◽  
Glass Cover

The author stated that four years since, in attempting to substitute fusion by the blowpipe for cement, in fixing their glass covers to slides, he noticed masses of crystals produced in the covers after the treatment, and believing them to be unkown, he named them after himself. To obtain the crytals he heats a thin glass cover on a piece of mica, over a spirit-lamp, holding both with forceps; then quickly turning them to the side of the flame, applies a blowpipe, withdrawing the cover to the apex of the flame for a few moments. An examination with a 1 or ½inch objective will then show the crystals. Similar results were ottseryed in a thin glass slide, after a similar treatment, when examined with a 1/12th objective. Specimens were sent with the paper, and the author suggests that it would be desirable to ascertain the chemical nature of the crystals, whether a silicate of lead or soda.

scholarly journals II. On the frequent occurrence of phosphate of lime, in the crystalline form, in human urine, and on its pathological importance

1860 ◽  
Vol 10 ◽  
pp. 281-288 ◽  
Keyword(s):  
Human Urine ◽  
Royal Society ◽  
Crystalline State ◽  
Crystalline Form ◽  
Frequent Occurrence ◽  
The Other ◽  
Triple Phosphate ◽  
Frequent Presence ◽  
At Home

In 1854 I submitted to the Royal Society a paper “On the frequent occurrence of Indigo in Human Urine.” This communication, which was published in the ‘Philosophical Transactions,’ attracted considerable attention both at home and abroad. The singular fact of the frequent presence of indigo in the urine, first announced by me, has since been amply confirmed by a variety of observers. I have now to place before the Society some investigations in relation to the not uncommon occurrence in human urine of phosphate of lime , as a deposit , in a well-marked crystalline form. When the earthy phosphates are treated of by writers, in connexion with the urine, they are usually described collectively, and it is seldom that each kind of phosphate is particularized, and yet there are several which may occur either separately or together. The phosphate of ammonia and magnesia, or triple phosphate, is indeed often specified, but rarely is phosphate of lime separately mentioned, and phosphate of magnesia scarcely ever; and yet phosphate of lime is very frequently present as a deposit in urine, much more so, indeed, according to my experience, than the triple phosphate, excluding those cases of the occurrence of that ammoniacal phosphate, arising from the decomposition of the urea of the urine subsequent to its escape from the kidneys. Even in those few cases in which phosphate of lime is specially mentioned, it is described usually as mixed up with the other phosphates, and always as occurring in the amorphous or granular , and never in the crystalline state; further, no peculiar importance is attached to it, as contrasted with the magnesian phosphate.

III. Some remarks on the physiological action of the Tanghinia venenifera

1859 ◽  
Vol 9 ◽  
pp. 173-174
Keyword(s):  
Royal Society ◽  
Good Description ◽  
The Other ◽  
Alcoholic Extract ◽  
Physiological Effects ◽  
Botanical Knowledge ◽  
Full Effect ◽  
First Time ◽  
Real Action ◽  
Botanical Magazine

The famous poison-tree of Madagascar was described for the first, time by Aubert du Petit Thouars in his ‘Genera Madagascarensia,’ under the name of Tanghinia venenifera . At a later period, Sir W. Hooker published a good description, with a figure of this tree, named by him Cerbera Tanghin (see Botanical Magazine, pi. 2968), so that nothing is wanted with regard to the botanical knowledge of this plant. On the other hand, the physiological effects of its poisonous parts have not been hitherto investigated. All we know is, that the fruit of the Tanghinia is a strong poison, and is used in Madagascar as an ordeal poison in the most strange and revolting way. The only experiment on animals made by Ollivier, showed that 12 grains kill a dog in some hours, but this experiment gave no further in­ sight into the real action of the Tanghinia. We hope, therefore, that the Royal Society will take some interest in the experiments which we undertook with this poison, of which the following is a short abstract. The poison used by us was the alcoholic extract of the leaves and small stems of the Tanghinia, prepared from dried specimens, which Prof. Pelikan had received from Count Seyderitz of Mecklenburg. About one centigram of this extract was sufficient to show the full effect of the poison on frogs, when introduced into a wound of the back. It acted also when given by the mouth, but in this case a somewhat larger dose was required to produce a full effect.

scholarly journals XVI.—On the Alkaloids contained in the Wood of the Bebeeru or Greenheart Tree (Nectandra Rodiœi, Schomb.)

1869 ◽  
Vol 25 (2) ◽  
pp. 567-573
Author(s):  
Douglas Maclagan ◽  
Arthur Gamgee
Keyword(s):  
Royal Society ◽  
Chemical Study ◽  
Crystalline Form ◽  
General Properties ◽  
Medicinal Use ◽  
Gold Mercury

In a paper read before the Royal Society of Edinburgh in April 1843, Dr Maclagan described the general properties of the alkaloid, whose presence had been indicated in the bark of the bebeeru or greenheart tree, by Dr Rodie of Demerara, and described the mode of preparation of its sulphate for medicinal use. The fact that bebeerine appeared to possess marked antiperiodic properties, rendered its careful chemical study desirable, and accordingly the alkaloid, purified as far as possible, was subjected to analysis by Drs Maclagan and Tilley. It resulted from this research that bebeerine is an uncrystallisable base, very soluble in alcohol, less so in ether, and very sparingly so in water. It forms with acids salts which are all uncrystallisable. With perchloride of gold, mercury, copper, and platinum, it gives precipitates which are soluble to a certain extent in water and alcohol, but which are deposited in a non-crystalline form when the solution cools. To this base the author assigned the formula C35H20N2O6(C = 6). Von Planta subsequently attempts to purify further the alkaloid, and assigned to it the formula C36H21O6N(C = 6) or C18H21O3N(C = 12.)

Hole Formation in Gold Films

1972 ◽  
Vol 30 ◽  
pp. 510-511
Author(s):  
R. W. Vook ◽  
R. Cook ◽  
R. Ziemer
Keyword(s):  
Deposition Rate ◽  
Quartz Crystal ◽  
Evaporation Rate ◽  
Gold Films ◽  
Hole Density ◽  
Hole Formation ◽  
Microscope Slide ◽  
Crystal Film ◽  
Glass Microscope Slide ◽  
Glass Microscope

During recent experiments on Au films, a qualitative correlation between hole formation and deposition rate was observed. These early studies were concerned with films 80 to 1000A thick deposited on glass at -185°C and annealed at 170°C. In the present studies this earlier work was made quantitative. Deposition rates varying between 5 and 700 A/min were used. The effects of deposition rate on hole density for two films 300 and 700A thick were investigated.Au was evaporated from an outgassed W filament located 10 cm from a glass microscope slide substrate and a quartz crystal film thickness monitor. A shutter separating the filament from the substrate and monitor made it possible to obtain a constant evaporation rate before initiating deposition. The pressure was reduced to less than 1 x 10-6 torr prior to cooling the substrate with liquid nitrogen. The substrate was cooled in 15 minutes during which the pressure continued to drop to the mid 10-7 torr range, where deposition was begun.

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