The ordinates of the curve give the strain in cwts., and the **abscissae** the distance in miles measured from the Canso end; as the strain is proportional to the depth, 18 cwts.

Newlands in England, that if they are arranged in the order of their atomic weights they fall into groups in which similar chemical and physical properties are repeated at periodic intervals; and in particular he showed that if the atomic weights are plotted as ordinates and the atomic volumes as **abscissae**, the curve obtained presents a series of maxima and minima, the most electro-positive elements appearing at the peaks of the curve in the order of their atomic weights.

7 represents the specific volumes of mixtures of ammonium and potassium sulphates; the ordinates re presenting specific volumes, and the **abscissae** the per centage composition of the mixture.

9 illustrates the first case: the ordinates represent specific volumes, and the **abscissae** denote the composition of isomorphous mixtures of ammonium and potassium dihydrogen phosphates, which mutually take one another up to the extent of 20% to form homogeneous crystals.

During the first stage, when the magnetizing force is small, the magnetization (or the induction) increases rather slowly with increasing force; this is well shown by the nickel curve in the diagram, but the effect would be no less conspicuous in the iron curve if the **abscissae** were plotted to a larger scale.

The sides of the trapezette are the " bounding ordinates "; their **abscissae** being xo and xo+H, where H is the breadth of the trapezette.

Von Rohr's Theorie and Geschichte des photographischen Objectivs, the **abscissae** are focal lengths, and the ordinates wave-lengths; of the latter the Fraunhofer lines used are A' C D Green Hg.

The ordinates give the wave-lengths in, up. The **abscissae** give fc in 0.01 mm., commencing at fc fF.

The **abscissae** represent intervals of time, the ordinates the measured lengths of the growing filament.

The enclosed area for each temperature represents the total emission of energy for that temperature, the **abscissae** are the wavelengths, and the ordinates the corresponding intensities of emission for that wave-length.

The curve BPC is generally used with the **abscissae** spaced more conveniently for practical applications, and a modification of the diagram by J.