ARACIENIDA twelve ocelli . . . .
for respiration ; not more t Tree/work.
than four ocelli . . . .
The first order is divided into two families :— Palpi simple, pediform ; mandibles) Families.
armed with a moveable aud per fomted claw, emitting a poisonous Araneida.
Arachnida abdomen inarticulate, ter Palmonaria. J minated by spinnerets . . .
Palpi produced, cheliform, or shaped like pincers; mandibles with a move- pe` p 4 able digit; abdomen articulate, without spinnerets. . . .
The A rancidcr include our common Spiders. [Ana:sew:E.] The Pedipalpi include the Scorpions and their allies. [Scoftrm san.E.) The second- order, Trachearia, includes very various forms, as the Pycnogonuina and the Mites. [TRACHEARIA ACARID.E.] ARALIA'CEiE, Irytoorts, are a small natural order of plants, nearly related to the Umbettiferm, from which they are solely known by their young fruit consisting of more parte than two. The species of this order, which includes the Ivy [HEDEIrA], are frequently shrubby, and not uncommonly furnished with powerful hard prickles ; but they are often also herbaceous and unarmed, like umbelliferous plants themselves. As an illustration of the order, the American Ginseng (Pana.r guinguefoliunt) may be taken.
This plant, which is nearly related to the celebrated stimulating drug called Ginseng by the Chinese [PANAx], is found occasionally on the mountains of America, from Canada to the Carolinas. It was long since introduced into our gardens, but it is now seldom seen.
This natural order seems to possess little or no sensible properties, for I the singular invigorating power ascribed to Ginseng by the Chinese is considered to be apocryphal.
Many of the species of A raffia, on account of their aromatic pro perties, are employed in medicine. An aromatic gum-resiu Cem06 from A. rot-moon, A. hispida, and A. spinosa. A. smedieinalis is diaphoretic, and its shoots are employed in North America as a substitute for Sarsaparilla. A. edodis is employed in China as a sudorific, and its young shoots are eaten. The roots of Gunners scabra, or Tanks, is used by Wines on account of the tannin it contains. Mr. Darwin found it on the sandstone-cliffs of Chiloe, where it resembles rhubarb on a gigantic scale. One of the leaves measured nearly eight feet in diameter.