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A low wall, serving as a foundation, a substructure, or a terrace wall. It is especially employed by archæologists in two senses:

A genus of plants of the order Filices or ferns. The fructifications are in uncovered roundish points, called sori, scattered over the inferior surface of the frond or leaf. There are numerous species.

The anterior portion of the foot of a mollusk.

Same as Pseudopod.

A specially modified part of the ventral fin in male elasmobranchs, which serves as a copulatory organ, or clasper.

A rare element of the light platinum group. It is found in platinum ores, and obtained free as a white inert metal which it is very difficult to fuse. Symbol Rh. Atomic weight 104.1. Specific gravity 12.

tly with water, and to be preserved must be kept under petroleum or some similar liquid. Sodium is used combined in many salts, in the free state as a reducer, and as a means of obtaining other metals (as magnesium and aluminium) is an important commercial product. Symbol Na (Natrium). Atomic weight 23. Specific gravit…

A salt well known as a catharic under the name of Glauber's salt, which term is properly applied to the hydrate, Na2SO4.10H2O.

An abortive stamen, or any organ modified from an abortive stamen.

An expansion at the base of the style, as in umbelliferous plants.

An axis or stem produced by dichotomous branching in which one of the branches is regularly developed at the expense of the other, as in the grapevine.

The pin grass (Erodium cicutarium), a weed in California.

ed: black alkali, which may be any alkaline carbonate, but which practically consists of sodium carbonate (sal soda), which is highly corrosive and destructive to vegetation; and white alkali, characterized by the presence of sodium sulphate (Glauber's salt), which is less injurious to vegetation. Black alkali is so ca…

magnesia, possessing some of the qualities of alkalies. -- Alkaline metals, potassium, sodium, cæsium, lithium, rubidium. -- Alkaline reaction, a reaction indicating alkalinity, as by the action on limits, turmeric, etc.

See Allodium.

Pertaining to allodium; freehold; free of rent or service; held independent of a lord paramount; -- opposed to feudal; as, allodial lands; allodial system. Blackstone.

One who holds an allodium.

A feldspar closely related to orthoclase, but triclinic. It is chiefly a silicate of sodium, potassium, and aluminium. Sp. gr., 2.57 -- 2.60.

Any substance (but especially sodium hyposulphite) used in removing the excess of chlorine left in paper pulp or stuffs after bleaching.

A blasting powder or dynamite composed of nitroglycerin, wood fiber, sodium nitrate, and magnesium carbonate.