P A E 



[ 342] 



PEA 



in one lake or basin might be 

 marine, those in another might be 

 fresh, and thus two formations 

 containing different organic remains 

 might be deposited contempora- 

 neously. However the rocks of 

 this group may be eventually dis- 

 covered to differ from this type, 

 the labours of MM. Cuvier and 

 Brongniart on the rocks of the 

 Paris basin will not the less retain 

 that place in the annals of geology, 

 which by common consent has been 

 assigned them. Nor will the zoo- 

 logical discoveries of Cuvier, con- 

 stituting as they did such a 

 brilliant epoch in the history of 

 geological science, the less claim 

 the gratitude of geologists in suc- 

 ceeding ages. De la Beche. Lyell. 

 Bakewell. 



PA'ETICLES ELEME'NTAEY. The final 

 results of chemical analysis. Ele- 

 mentary particles are those of 

 which integrant particles are com- 

 posed ; thus, while the latter 

 remain invariable in the same 

 body, the former must vary with 

 the progress of chemistry. In 

 bodies really simple, the integrant 

 and elementary particles must be 

 the same. Cleaveland. 



PA'ETICLES I'NTEGEANT. These are 

 the smallest particles into which a 

 body can be reduced without de- 

 stroying its nature, or, in other 

 words, without decomposing it. 

 Only three forms of integrant 

 particles have hitherto been dis- 

 covered. They are the three most 

 simple, geometrical solids ; namely, 

 a tetraedron ; a triangular prism ; 

 and a parallelepiped, including" all 

 solids of six sides, parallel two and 

 two. 



PAE'TICLES OF MATTEB. The indefi- 

 nitely small or ultimate atoms into 

 which matter is believed to be 

 divisible. Their form is unknown ; 

 but though too small to be visible, 

 they must have magnitude. Mrs. 

 Somerville. 



PA'ETITE. (partitus, Lat.) Divided, 

 In botany, a partite leaf is one 

 separated to the base. 



PA'SSEEES. The third order of the 

 class Aves, or birds. The thrush, 

 warbler, sparrow, swallow, crow, 

 and lark, are comprised in this 

 order. 



PATE'LLA. (patella, Lat. a little deep 

 dish with a broad brim.) That 

 bone of the leg commonly known 

 as the knee-pan. 



PATE'LLA. In conchology, the limpet 

 shell. Animal a Umax. A marine 

 shell, univalve, subconic, shaped 

 like a basin ; without a spire. 

 The patella is found both recent 

 and fossil. Many species have 

 been found fossil in the neighbour- 

 hood of Paris. Patellae have also 

 been obtained from the Shanklin 

 sand, and from the Harwich cliffs. 



PATE'LLIFOEM. (from patella, a dish, 

 and forma, form, Lat.) Of the 

 form of a small dish. 



PATE'LLITE. A fossil patella. 



PA'TULOTJS. fpatulus, from pateo, Lat. 

 to be open.) In botany, spreading, 

 as a patulous calyx. In conchology, 

 gaping ; with a spreading aperture. 



PAVO'NIA. (from pavo, Lat. a pea- 

 cock.) "A genus of stony poly- 

 pifer, fixed and frondescent; the 

 lobes flat, subfoliaceous, erect or 

 ascending, with stelliferous rugge 

 or grooves on each side. The stars 

 lamellated, in rows, sessile, and 

 rather imperfect." Parkinson. 

 There are several known species. 

 A coral with a deep and isolated 

 cell, such cell containing a large 

 depressed polypus, very similar to 

 the actinia, as regards both its 

 structure and appearance. 



PEA OEE. | The Pisiform iron-ore 



PEA IBON OEE. ) of Kirwan. Masses 

 of pea iron ore are found on the 

 sea beach near Scarborough. This 

 species of ore, which is met with 

 in Germany, Era-neb, Switzerland, 

 &c. } yields from thirty to forty per 

 cent, of iron. Its colour is bluish- 



