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of mercuric iodide in potassium iodide (called the Sonstadt or Thoulet solution) having a maximum specific gravity of 3.2, or of borotungstate of cadium (Klein solution, specific gravity 3.6), and the like. Such solutions are much used in determining the specific gravities of minerals, and in separating them when mecha…

chemical effects, as in photography. These, in the usual photogrophic methods, have their maximum influence at and beyond the violet rays, but are not limited to this region. -- Chromatic spectrum, the visible colored rays of the solar spectrum, exhibiting the seven principal colors in their order, and covering the ce…

The line of continuous maximum descent from any point on a land surface, or that cutting all contours and angles.

A self-registering thermometer, especially one that registers the maximum and minimum during long periods. Nichol.

r instead of mercury, for ascertaining the precise temperature at which water attains its maximum density. This is about 39º Fahr., or 4º Centigrade; and from that point down to 32º Fahr., or 0º Centigrade, or the freezing point, it expands.

llen or risen markedly. In tabular form are shown changes of pressure and of temperature, maximum and minimum temperatures, and total rain for each weather station since the last issue, usually 12 hours.

ations are taken; of the third order when simpler work is done, as to record rainfall and maximum and minimum temperatures.