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Isogeothermic Lines

a term ina globe or map across those places in which are composed of the same elements, in the same proportions, but which differ either in their physical characteristics, ISOMERISM (i-som'er-ism), in chemmay be divided into three distinct classes: istry, a term applied to those bodies or in their chemical properties. They isomeric, metameric, and polymeric bodies. which show analogous decompositions Isomeric bodies or isomerides are those and changes, when heated, or when treated with reagents, but differ in and changes, when heated, or when physical properties.

Isomeric bodies or isomerides are those physical properties. formations when heated, or when acted Metameric bodies, or metamerides, are on by by reagents. tain the same elements in the same proportions, but have different molecular weights.

Polymeric bodies, or polymerides, con- ISOMORPHISM (i-sō-morfizm), a general law, discovered in 1819 by Professor Mitscherlich, of Berlin, by which It is that the ingredients of any species of mineral are not absolutely the variation of minerals is governed. gredient. Thus in augite the lime may be in part replaced by portions of peroxide of iron, or of manganese, while the fixed as to their kind and quality, but form of the crystal and the angle of the equivalent portion of some analogous in- It is that the ingredients of any single the variation of minerals is governed. general law, discovered in 1819 by Proany single ISONANDRA cleavage plane remain the same. substitutions are, however, confined within certain limits.

ISONZO These was made by the Italians to enable them to bring their big guns into such positions that they could open a heavy fire on the city itself and its defensive works. On Aug. 9 the Italians forced their way across the bridge at Gorizia and occupied the city. The city was taken, but the Austrians remained entrenched in the hills to the eastward, whence they could not be dislodged, and now it was the Austrian guns that bombarded the city.