does "crudely" here means that it was written "unskillfully" or not?
There is one factor which has been scarcely touched upon in this examination. It is the character and career of Mrs. Fish, afterwards Mrs. Underhill, who as Leah, the elder sister, plays so prominent a part in the matter. We know her chiefly by her book, " The Missing Link in Modern Spiritualism" (Knox & Co., New York, 1885). This book was written by a friend, but the facts and documents were provided by Mrs. Underhill, who checked the whole narrative. It is simply and even crudely put together, and the Spiritualist is bound to conclude that the entities with whom the Fox circle were at first in contact were not always of the highest order. Perhaps on another plane, as on this, it is the plebeians and the lowly who carry out spiritual pioneer work in their own rough way and open the path for other and more refined agencies.