Palladium, one of the rare metals, was first separated from native Platinum by Wollaston in 1803, and Was named after the planet Pallas, which had been discovered just before that time by Olbers. Hering, who made the first provings in 1850, says: “If we classify the Sulphides according to their solubility in dilute acids, Pallad. must be placed with Argentum, Rhodium, Ruthenium, and Osmium, and Platina remains with the less soluble Mercury, Aurum, and Iridium. Platinum and Palladium, both proved in dust form, showed such similarity in their effects that the question arose whether corresponding differences might be found.
The chief characteristic of Pallad. in the mental sphere is “Love of approbation,” which lays its victim an easy prey to slights real or imaginary, and easily gives place to a state of “wounded pride and fancied neglect”; irritability which often finds vent in violent expressions. Such a patient is > in society, and < after the party or entertainment. This state of mind (which differs from the hauteur of Plat.), when found associated with uterine and ovarian disorders, will surely indicate Pallad. There is much uterine bearing down, and even prolapse. Many head symptoms were noted, and this has been confirmed: "Headache across top of head from one ear to the other." According to Hering the pains of Pallad. are fleeting and transient and hard to describe. Peculiar symptoms are: As if he had grown taller. As if something horrible would happen. Palladium is chemically and symptomatically near to Platina. It is of use principally for its action on the female genital organs. Its characteristic mental symptoms seem to find origin in the sexual symptoms, and form, with the latter, a useful and precise group for practical use. The patient is inclined to weep. She suffers from mental excitement, particularly in company. She always, has an ag- gravation of her symptoms* the day following an evening's entertainment. She is easily put out of humor, and is then inclined to use pretty strong language. She imagines herself very much neglected, and as she attaches great importance to the good opinion of others, this annoys her very much. The Platina woman is very different. She is egotistical in another form. Under Palladium, pride is easily wounded. Palladium has a very characteristic headache, which makes the patient very irritable. It extends across the top of the head from ear to ear. The face is sallow, with blue rings around the eyes. There are also nausea, usually worse in the evening, and very acid eructations. The bowels are constipated, the stools often being whitish in color. Soreness in the abdomen with downward pressure, a very common symptom in uterine diseases; pain in the uterus and bladder after any exertion during the day; knife-like cutting pains in the uterus, which are relieved after stool; constant tired feeling in the small of the back; she is so tired that she actually reels; she feels drowsy; she complains that she feels sore and bruised all over; heaviness as from lead, deeply seated in the pelvis, worse from any exertion, and worse standing; walking is much less irksome to her than is standing; lying on the left side relieves; swelling in the region of the right ovary, with shooting pains from navel into the pelvis, and with this there is bearing down, relieved by rubbing. Jelly-like leucorrhoea. These local symptoms, together with those of the mind, make up the complete Palladium picture.