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 artistic style, but it may have done the opposite effect, as reflected in this poem. "Lines Composed in a Wood on a Windy Day" was written at Green Thorpe during Brontë's three-year stay from 1842-1845, and may have been influenced by homesickness. She wrote the poem on December 30, 1842. It was composed during the Victorian Crisis of Faith, a period which played a major role in poems and literature during its time. The meter may have been derived from Thomas Moore's style based on Irish folk song. His poem "I saw from the beach" has four quatrains similar in