Iridium Metallicum

The metal. Jr.

One of the metals of the platinum group, among the heaviest of known sub- substances and almost indestructible.

Introduced by Hering in 1853.

The precipitate made by Genth was triturated by Boericke ; one ten thousandth part of it produced a vivid black.

Twenty grains of , the 3d trituration were taken by A. J. Tafel when in a state of perfect health. It is the only proving of Iridium and not contained in Allen's Encyclopedia. All the symptoms were experienced within two hours.

* Outer Head. Pain in middle of occipital bone.

^ Sight and Eyes. A feeling as if the eyes were being affected

from below upward. ^ Hearing and Ears. Feeling of numbness in ears and

throughout the body, lasting but a short time.

^ Upper Face. Pain in 1. malar bone, a kind of stinging;

from this place a kind of warmth spreads over the whole

face; the pain is also felt in r. malar bone like a pressure.

Feeling as of a triangle in face, the base is formed by the

two malar bones, the apex in the vertex.

'^ Inner Mouth. Increased saliva with sensation in malar

bones which is more perceptible on 1. side. ^^ Upper Limbs. A transient pain on inner side of wrists,

particularly the left, also in bend of knee joint. ^ Lower Limbs. Pressing in anterior portion of 1. thigh in middle of upper half, followed by pressing in groin. While walking, feeling of tension in both thighs, particu- larly in 1.; then a dislocated feeling in 1. hip joint,- and a dull pain tending toward 1. gluteal region. Cramp-like contraction in r. calf and middle of sole of foot. ^ Rest.

Position. Motion. While walking : feeling of ten- sion in both thighs. "Locality and Direction.

Right: pain in malar bone; cramp-like contraction in calf. Left: pain in malar bone; sensation more perceptible in malar bone; transient pain in wrists, < 1.; pressing in anterior portion of thigh ; feeling of tension in thigh ; dislocated feeling in hip joint; dull pain tending towards gluteal region. From below upward: eyes affected. *^ Sensations. As if the eyes were being affected from below

265 IRIDIUM— IRIS VERSICOLOR.

upwards; as of a triangle in face, the base formed by

the two malar bones, the apex in the vertex. Pain: in middle of occipital bones. Stinging pain : in 1. malar bone. Cramp-like contraction: in r. calf and middle of sole of

foot. Pressure-like pain: in r. malar bone. Dull pain: tending toward 1. gluteal region. Transient pain: on inner side of wrists; in knee joints. Pressing: in anterior portion of 1. thigh, in middle of

upper half; in groin. Dislocated feeling : in 1. hip joint. Feeling of tension : while walking, in both thighs. Numbness: in ears and throughout whole body.