His last book, "Making Sex: Body and Gender From the Greeks to Freud" (1990), was a highly original investigation of a tantalizing mystery he had stumbled on in the archives: Why did female orgasm, long considered essential to conception, all but disappear from the historical record during the Enlightenment?
In the humoural model of the body a satisfactory balance of the humours was essential for conception to take place.
Something essential in the conception or the construction skews its focus.
Although the upward movement of nutrients is essential to our conception of the whale pump, the feeding of marine mammals at the surface, especially on prey that migrate across the pycnocline themselves, and the subsequent excretion of nutrients at the surface are important parts of the overall pattern of the pump.
Regarding the cell membranes, there are several points to keep in mind for the next section: First, even though Schwann assigned them essential roles, his conception of cell membranes as hardened interface structures is completely different from our current knowledge of the subject.
Modern studies have increased knowledge of him but have not altered in its essentials the medieval conception of a great king.
Close-ups of gestures are also essential to Genet's conception of the novel, since in his ontology accidents determine fate, gestures form character and costume triggers events.
From Aristotle to Mill the appearance condition was an essential part of the conception of fallacies.
Allowing adult persons and some children to make their own health care decisions is an essential component of this conception of autonomy.
The idea of progress plays an essential role in Vives' conception of intellectual history, and several of the cultural problems he deals with, such as the causes of the corruption of the arts, are approached from an historical perspective.
