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As a result of these long inductions and deductions we may rest assured that all the cells possess a definite primary sexual determinant which must not be assumed to be alike or nearly alike throughout the same body. Every cell, every cell-complex, and every organ have their distinctive indices on the scale between thelyplasm and arrhenoplasm. For the exact definition of the sex, an estimation of the indices over the whole body would be necessary. I should be content to bear the blame of all the theoretical and practical errors in this book did I believe myself to have made the working out of a single case possible.

Differences in the primary sexual determinants, together with the varying internal secretions (which differ in quantity and quality in different individuals) produce the phenomena of sexually intermediate forms. Arrhenoplasm and thelyplasm, in their countless modifications, are the microscopic agencies which, in co-operation with the internal secretions, give rise to the macroscopic differences cited in the last chapter.