Curious to relate, the species was wholly omitted in the twelfth edition of the 'Systema.'

I have never spoken of that as a natural method; on the contrary, in my Systema, p. 8, sect.

The species (for want of a good figure) was not clearly defined until the twelfth edition of the 'Systema.'

We in this have, I think, explained that other problem presented by the Systema Theologicum.