systematical

Not being able to investigate every point of systematical and physiological botany thoroughly himself, he, with amiable deference, often trusted to those who had more particularly studied certain subjects.

From Lachesis Lapponica A Tour in Lapland, Volume 1 by Carl von Linn?

I shall publish in a little while a big book about the commonwealth of faery, and shall try to make it systematical and learned enough to buy pardon for this handful of dreams.

From The Celtic Twilight by W. B. (William Butler) Yeats

By perpetual practice, language had, in his mind, a systematical arrangement; having always the same use for words, he had words so selected and combined as to be ready at his call.

From The Works of Samuel Johnson, LL.D. in Nine Volumes Volume the Eighth: The Lives of the Poets, Volume II by Samuel Johnson

It is then to put her commerce with us on systematical ground, and under safe cover, that it behoves Great Britain to enter into treaty.

From Memoir, Correspondence, And Miscellanies, From The Papers Of Thomas Jefferson, Volume 1 by Thomas Jefferson Randolph

Can your Lordships believe that this can be any other than a systematical, deliberate fraud, grossly conducted?

From The Works of the Right Honourable Edmund Burke, Vol. 10 (of 12) by Edmund Burke