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Variability in chemical constitution without variation in crystalline form.

property of existing in two or more conditions which are distinct in their physical or chemical relations.

ated work of Ptolemy of Alexandria, which contains nearly all that is known of the astronomical observations and theories of the ancients. The name was extended to other similar works.

A book or table, containing a calendar of days, and months, to which astronomical data and various statistics are often added, such as the times of the rising and setting of the sun and moon, eclipses, hours of full tide, stated festivals of churches, terms of courts, etc. Nautical almanac, an almanac, or year book, co…

elating to Alphonso X., the Wise, King of Castile (1252- 1284). Alphonsine tables, astronomical tables prepared under the patronage of Alphonso the Wise. Whewell.

Uniting the chemical rays of light into one focus, as a certain kind of lens; amacratic.

A compound radical, NH4, having the chemical relations of a strongly basic element like the alkali metals.

t as indicated by the compass. The difference between the magnetic and the true or astronomical amplitude (see 3 above) is the "variation of the compass."

, having a movable horizon or cursor; -- formerly much used in solving some common astronomical problems.

The separation of a compound substance, by chemical processes, into its constituents, with a view to ascertain either (a) what elements it contains, or (b) how much of each element is present. The former is called qualitative, and the latter quantitative analysis.

analyzes; formerly, one skilled in algebraical geometry; now commonly, one skilled in chemical analysis.

The doctrine that the anatomical structure explains all the phenomena of the organism or of animal life.

The science which treats of the structure of organic bodies; anatomical structure or organization. Let the muscles be well inserted and bound together, according to the knowledge of them which is given us by anatomy. Dryden.

An electro-negative element, or the element which, in electro- chemical decompositions, is evolved at the anode; -- opposed to cation. Faraday.

A hymenopterous insect of the Linnæan genus Formica, which is now made a family of several genera; an emmet; a pismire.

ture ants, etc. The common American species is Myrmeleon obsoletus, the European is M. formicarius.

Inimical to bacteria; -- applied esp. to serum for protection against bacterial diseases.

ry substance, resembling a metal in its appearance and physical properties, but in its chemical relations belonging to the class of nonmetallic substances. Atomic weight, 120. Symbol, Sb.

A cavern or cavity, esp. an anatomical cavity or sinus. Huxley.

en duty, experimental or operative; any complex instrument or appliance, mechanical or chemical, for a specific action or operation; machinery; mechanism.