RAD 



[ 379 ] BAM 



" In the lowest tribes of animals 

 the internal organization relates 

 almost solely to digestion, and the 

 food consists almost entirely of 

 the simplest forms of animal 

 matter. The alimentary canal has 

 often but one orifice, it is seldom 

 provided with masticating organs, 

 and scarcely a trace of any glandu- 

 lar organ is yet observed to assist 

 in the process of assimilation." 

 Prof. Grant. 



BA'DIATE. In botany, a corolla con- 

 sisting of a disk, in which the 

 corollets are tubular and regular, 

 and of a ray, in which the florets 

 are irregular. 



BA'DIATED. (radiatus, Lat.) 



1 . Adorned with rays. 



2. Belonging to the division Had iata. 



3. In mineralogy, when the fibres 

 are broad and flat, and diverging 

 as from a centre. 



BA'DIATED IRON PYRI'TES. A variety 

 of sulphuret of iron of a pale bronze 

 yellow, more or less inclining to 

 steel-grey, or to brass-yellow. 

 When its form is spherical, the 

 fibres diverge from the centre ; 

 when nearly cylindrical, from the 

 axis. Its constituents are iron 

 46-03, sulphur 53'97. It occurs 

 more particularly in the chalk 

 deposit. 



BA'DIATED QUA'RTZ. A variety of 

 common quartz occurring in masses 

 having a crystalline structure and 

 composed of imperfect prisms, 

 closely applied to each other, and 

 sometimes terminating in pyramids 

 at the surface. 



RA'DICATED. (radicatus, Lat.) In 

 conchology, when the shell is fixed 

 by the base, or by a byssus, to 

 some other body. 



BA'DICAL. (from radix, Lat. a root.) 

 Primitive ; original. In botany, 

 radical leaves are such as spring 

 from the root ; the dandelion is a 

 familiar example. 



BA'DICLE. (radicula, a little root, 



from radix, Lat. radicule, Fr.) In 

 botany, that part of the embryo 

 which grows downwards and be- 

 comes the root. The primary ob- 

 ject of vegetable structures appears 

 to be the establishment of the 

 functions of nutrition; and we 

 find that while the plumule, burst- 

 ing from its enveloping capsule, 

 proceeds to extend itself vertically 

 upwards, at the same time, slender 

 filaments, or radicles, shoot out 

 below to form the roots. 



BA'DII VECTO'RES. Imaginary lines 

 joining the centre of the sun and 

 the centre of a planet or comet, 

 or the centres of a planet and its 

 satellite. 



RADIOLI'TES. A genus of irregular 

 inequivalved fossil shells obtained 

 from that part of the Pyrenees 

 which is named Les Corbieres. 

 They are striated externally. The 

 inferior valve is in the form of a 

 reversed cone ; the superior valve 

 convex. They have neither hinge 

 nor cartilage. 



BA'DITTS. (radius, Lat.) 



1. The semi- diameter of a circle. 

 The mean radius of the earth is 

 intermediate between the distances 

 of the centre of the earth from the 

 pole and from the equator. 



2. One of the bones of the fore- 

 arm, or that part of the upper 

 extremity which extends from the 

 elbow to the wrist : the fore-arm 

 contains two bones, the radius and 

 the ulna. 



RAGG. | Called also Bowley ragg, 

 BA'GSTONE. j or Dudley basalt. A 

 fusible silicious stone, of a dark 

 grey colour, occurring near Dudley. 

 BA'MOSE. | (from ramus, a branch, 

 BA'MOUS. j Lat.) Branched ; full 

 of branches. Applied also to flowers 

 growing on the branches ; to pedun- 

 cles proceeding from a branch ; 

 and also to leaves growing on 

 branches when they differ from 

 those on the stems. Minerals 



