-- What is the foundation of moral obligation? -- How can it be accounted for that an inflammable spirit is obtained from regenerated tartar (vinegar saturated with chalk or saccharum saturne by distillation)? Or how comes it about that vinegar is restored to the state of an ardent spirit by being distilled with fixed alkali, chalk, or lead? 16, 1759 30. Gregorie.-Whether the Socratic method of instruction or that of prelection is preferable. 8, 1760. How far the ancient method of education in public seminaries from earliest infancy was preferable or inferior to the modern practice. By Dr.英文原著 · 《The Scottish Philosophy》
To Purify Water.--Filter the water well, and then add about three drops of nitric acid to the pint. This can be used as absolutely pure water, but I would recommend the use of distilled water as preferable.英文原著 · 《American Hand Book of the Daguerreotype》
Sealing Wax for Bottles.--Melt together six parts rosin and one beeswax, and add a small quantity of lampblack; or, if red is preferable, add red lead. Common white wax is best, as most chemicals act less upon it.英文原著 · 《American Hand Book of the Daguerreotype》
When perfectly dry, pulverize, and it is ready for use. With a little trouble you will obtain in this way a much better article than can generally be bought of dealers. For the last washing, alcohol, or a mixture of alcohol and water, is preferable."英文原著 · 《American Hand Book of the Daguerreotype》
Expose an impressioned plate, that has been sufficient time in the camera to become solarized, to the vapors of bromine, and the impression will be fully developed and exhibit no signs of solarization. The exposure over the bromine most be very brief. Chlorine or iodine will produce the same result. The latter is preferable.英文原著 · 《American Hand Book of the Daguerreotype》
Hyposulphite of Gold.--This compound salt is by a few considered preferable to the chloride of gold, but our experience has induced us to use the latter, believing we are enabled to produce a more brilliant and warm-toned impression with it. When the hyposulphite of gold is used in gilding, it requires less heat and a longer application, as there is some danger of producing a glossy scum over some parts of the surface of the plate. I prepare this salt as follows:英文原著 · 《American Hand Book of the Daguerreotype》