And to do so he must know what he was aiming at; he must know for certain what was best for each, and having ascertained this it was natural for him to help them both.
Moreover, the question he had to decide was not how soon the blood had dried, but where Dmitri Fyodorovitch had run with the pestle, or rather, whether it really was to Fyodor Pavlovitch’s, and how he could satisfactorily ascertain.
The prosecutor and counsel for the defense began cross-examining her, chiefly to ascertain what had induced her to conceal such a document and to give her evidence in quite a different tone and spirit just before.
The prosecutor could only draw one conclusion: that the man had jumped back "at such a moment and in such excitement simply with the object of ascertaining whether the only witness of his crime were dead; that he must therefore have been a man of great strength, coolness, decision and foresight even at such a moment," …. and so on.
There are no more uses of "ascertain" in the book.
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A committee was formed to ascertain the level of public support for a new bike path.
The slaveholders have been known to send in spies among their slaves, to ascertain their views and feelings in regard to their condition.
Douglass, Frederick -- Narrative of the Life of Frederick Douglass An American Slave