He mocked our most diligent and exquisite indagation.
For the better indagation of the nature of the Holy Ghost, I shall proceed by certain steps and degrees; which as they will render the discourse more clear, so will they also make the arguments more evident.
Paracelsus directs us, in the indagation of colours, to have an eye principally upon salts.
I perceived that some insight into chemical operations was highly conducive to the true knowledge of nature, and especially to the indagation of several of her most abstruse mysteries
This matter stands in need both of a higher indagation, and of a longer explication than is pertinent to the present inquisition.