Chambers's encyclopædia; a dictionary of universal knowledge . course, bedecided by observation of facts, iu judging of which,however, questions of no little difficulty must oftenarise as to what are and what are not differentspecies. The subject of the hybridisation of plants wasfirst investigated, and ^^-ith great care and verynumerous experiments, b)^ Kblreuter, in the endof the ISth c, and has been more recently studied?\^-ith much attention by Dean Herbert of Manchester,Van Mons, and particularly Gaertner. HYDASPES. See Jelum. HYDATID (fi-om the Greek 7n/dafis, a wateryvesicle), a term in
Chambers's encyclopædia; a dictionary of universal knowledge . course, bedecided by observation of facts, iu judging of which,however, questions of no little difficulty must oftenarise as to what are and what are not differentspecies. The subject of the hybridisation of plants wasfirst investigated, and ^^-ith great care and verynumerous experiments, b)^ Kblreuter, in the endof the ISth c, and has been more recently studied?\^-ith much attention by Dean Herbert of Manchester,Van Mons, and particularly Gaertner. HYDASPES. See Jelum. HYDATID (fi-om the Greek 7n/dafis, a wateryvesicle), a term indefinitelj^ applied to severaldistinct objects of a vesicidar or cyst-like character,which are found in the bodies of men and certainmammals. True hydatids were formerly regardedas cjstic Entozoa (q. v.), such as Cysticercus,Ccenurus, and Echinococcus, but all these animalforms are now discovered to be larval stages oftsnia or Tape-worm (q. v.). These hydatids mayoccur in almost any part of the body, and theyhave been observed in man, the ape, the ox, the. Hydatids:Copied from Kymcr Joness Animal , Ctcnurus Cerebralis, natural size ; 2, one head magnified ;n, oval circlet of hooks; b, suckers : 3, Crsticercus Tenuicollis,natural size; 4, head magnified; a, circlet of books;6, suckers. sheep, the hoi-se, the camel, the pig, the kangaroo,and some other vegetable feeders, but they appar-ently do not occur in carnivorous animals or inthe rodents. They are generally enclosed in anexternal sac, which is attached to the tissue of476 the organ in which it is situated, and which isfreqiiently common to many hjdatids, each ofwhich has a distinct envelope. The fluid in theinterior of the hydatid itself is almost alwayscoloiu-less and hmpid, but the fluid in the commoncj-st in which the hjdatids float is often of ayellow colour. The Ccenurus cerebralis is found inthe brain of various ruminants, and gives rise tothe disease in sheep kno^\Ti as the staggers. Whenthe hydatid occurs
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