This is the revised version of Peter Laslett's acclaimed edition of Two Treatises of Government, which is widely recognised as one of the classic pieces of recent scholarship in the history of ideas, read and used by students of political theory throughout the world. This 1988 edition revises Dr Laslett's second edition (1970) and includes an updated bibliography, a guide to further reading and a fully reset and revised introduction which surveys advances in Locke scholarship since publication of the second edition. In the introduction, Dr Laslett shows that the Two Treatises were not a rationalisation of the events of 1688 but rather a call for a revolution yet to come.

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We describe reproductive isolation caused by a gene transposition. In certain Drosophila melanogaster-D. simulans hybrids, hybrid male sterility is caused by the lack of a single-copy gene essential for male fertility, JYAlpha. This gene is located on the fourth chromosome of D. melanogaster but on the third chromosome of D. simulans. Genomic and molecular analyses show that JYAlpha transposed to the third chromosome during the evolutionary history of the D. simulans lineage. Because of this transposition, a fraction of hybrids completely lack JYAlpha and are sterile, representing reproductive isolation without sequence evolution.