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Essence of Materia Medica – page 180

not assertive nor aggressive.
The classic Silica children come from elite, highly educated families. They are delicate, and they easily develop curvatures of the spine. Their intelligence is so great, however, that it has pathological consequences. It seems that they become over-stimulated, and then the lack of mental stamina results later in life. Most children, if corrected by their mother, will remember it for a few days and then go back to making the error. Silica children, how-ever, never forget. They understand quickly the reason for the correction, and they impose upon themselves the correct behaviour. In a child,’this represents excessive mental suppression. Silica children are too serious, too proper.
The overstimulation of mind followed by lack of stamina is the basis for the descriptions in the books of professionals who develop an aversion to their work. They feel incapable of performing their functions any more. This can be compared with Calc. carb., which may also have a lack of mental stamina, but this arises more from anxiety and worries. In general, Calcarea patients are more coarse, more survival-oriented. They worry about expenses, about unforeseen possibilities, etc. and they develop defences against these worries. Silica is more refined, delicate and vulnerable.
Just as Silica can be easily imposed upon, or suppressed, mentally, so this can occur on the physical plane. They tend to per¬spire profusely, especially in the axillae, the back of the neck, and on the feet, and they always do well as long as the perspiration is permitted. Do not be impatient to treat the Silica perspiration. If you succeed by any means in suppressing it, you and the patient will encounter a lot of trouble. If the sweat is suppressed by deodorants, foot powders, boric acid etc. the patient may well develop tuberculosis, cancer, kidney disease, or other serious disease.
Suppression of sweat by medication, of course, presents the most serious problems, but even evaporation can have similar effect— albeit less deep. If a perspiring Silica patient is exposed to a draft, which evaporates the sweat, he may develop a headache or arthritic pains. The perspiration itself is highly characteristic in Silica. It is both offensive and acrid. The offensiveness is quite strong. The patient may wash his feet three times a day