4 adjectives to describe researchers

"Since the labours of the psychic researchers began, we have heard of a great many strange things; but it is evident that he is a young man of education and culture, and in all probability a journalist or literary man.

[Illustration] The subject of the above engraving claims the attention of the antiquarian researcher, not as the lofty sculptured mansion of our monastic progenitors, or the towering castle of the feudatory baton, for never has the voice of boisterous revelry, or the tones of the solemn organ, echoed along its vaulted roof; a humbler but not less interesting trait marks its history.

" Stead, the English editor and psychical researcher, relates the following case, which he accepts as truthful and correct, after careful investigation of the circumstances and of the character and reputation of the person relating it.

Our men of intellect become scientific researchers, historians, erudite persons.

4 adjectives to describe  researchers