Phase diagram can be constructed that show the effect of more than two variables on the phase of a substance. Phase diagrams can use other variables in addition to or in place of temperature, pressure and composition, for example the strength of an applied electrical or magnetic field, and they can also involve substances that take on more than just three states of matter. One type of phase diagram plots temperature against the relative concentrations of two substances in a mixture called a "binary phase diagram", as shown at right. Such a mixture can be either a solid solution, eutectic or peritectic,
Lines Composed in a Wood on a Windy Day five and nine, as well as the erasures before "sunshine" and "above" suggest that the poem was written hastily. One interpretation by Winidred Gerin says that in the poem "emotion and expression have achieved a fusion as felicitous as it is rare in Brontë's writing, is probably the best poem she ever wrote, though not the most characteristic". The poem is based upon an actual experience of Brontë's. A note stating "Composed in the Long-Plantation on a wild bright windy day", was written in Anne Brontë's hand at the bottom of the manuscript and the "Long-Plantation" was identified by Edward