The Elements by Jan Scholten published by Homoeopathic Medical Publishers in January 1996.
In the foreword Dr. Debats suggests the readers to take up the following exercise "Take a large sheet of paper and draw a grid of 18 vertical columns and 7 horizontal lines and then proceed to fill in the elements in the usual way, starting with Hydrogen, Helium, Lithium etc according to the Periodic Table.
Next take the most extensive Materia Medica you can find and make a note of the most important Rubrics of each Element, in it's appropriate compartment.
When you have done that, stand back and take a look. You will notice that most of the spaces are empty, while others are filled up with Polycrest Remedies."
This thought-provoking statement compelled to evaluate the remedies from one of the most authentic source repertory, Boenninghausen's Therapeutic Pocket Book. (B.T.P.B).