{Eperia diad^na. ~Fi. Araiynie Porte-eroix, AraigJile diaiema, Araigiiie- a'croi3 pafiuU; Qt. Ereat^^pinne.) Tiiia spider is foHnd all over Europe and America, in statiles, on old. walla, etc. It may he diatinguislied by its ovoid form of liody; often as- Urge as a small nut; a longitudinal line on the hack, composed of yellow and white points, and traversed by three other similar lines. Tliis is some- dbyGoogle 50 ABAHEA DIADEMA. times called the "Geographieal Spider," on account or its circular web, with latitudinal and longitudinal lines. Officinal PBEPABATioNS.^Dr. Gross recomniGnds a puncture to be made in tlie belly of the living insect, and that the seroaity which flows OHt be collected on one hundred grains Sugar of Milk, and the fli'st three triturations be made from it. (I can see no good reason for such a recommendation. First, we get no certain strength for a starting point, aa many circumstances will render the flow of his serosity very uncertain; secondly, it is probable that what- ever of poisonous fluid there may be in tbe insect is not in the belly, but somewhere in the head.} Dr. Hering recommends that the whole insect be macerated with alcohol for some months, and that then the alcoholic attenuation be pre. pared from tliis tincture. I would recommend that one live spider be used for every one hundred minims of absolute alcohol, and macerated for ten or twelve days; dilutions be made from this, or that a trituration be made by triturating Oie live spider with sugar of milk — one to each one hundred grains.