The experiments made by Mr. Crookes, in regard to the alterations
in the weight of bodies, enters the category of psychic phenomena
examined with the most mathematical exactitude, by the aid of accurate
registering apparatus. It is in these experiments that the celebrated
English physician was able to witness _Psychic Force_ developed by his
_medium_.
The description and designs of the apparatus thus used may be found in
the “_Moniteur de la Policlinique_,” of the 7th and 14th of May, 1882,
and in “_Le Spiritisme_” of Dr. Paul Gibier, published in the year 1887.
This article is too lengthy for reproduction in this work, but we have
the right to consider it as the point of departure for experimental
psychology, for not only have they not been denied in France and other
countries, but _they have been recognized as absolutely true_, by
several colleagues of Mr. Crookes, belonging to the _Royal Society of
London_.