CRESS 



88 



CRUEA 



When only a small crescent-shaped portion 

 of the bright side is turned to the earth, and 

 tho moon sets soon after the sun. 

 Cress, (kres). [CVes.se, the A.-S. name.] An 

 herb belonging to Cruciferse. 

 Cretaceous series, (kre-ta'she-us). [The Latin 

 word.] The uppermost of the Secondary 

 formations, divided into upper or cJialk, 

 and lower or greensand. 

 Crevasses, (kre-vas'ez). [The French -word.] 

 Deep narrow openings or cracks in an em- 

 bankment, glacier, &c. 



Cribriform plate, (kri'bri-form). [L. cribrum, 

 sieve ; forma, form.] In the roof of the nose, 

 separating the nasal cavities from the brain. 



Crickets, (krik'ets). [Cricfad, the Welsh 

 name. ] = Achetina : 

 insects which have 

 long hind legs, and 

 can leap a long way, 

 belonging to Orthop- 

 tera. 



Cricoid cartilage, (krrV Cricket 



koid). Gk. krikos, ring ; eidos, form.] A 

 ring of gristle forming the top of the wind- 

 pipe. 



Crinoidea, (krin-oi'de-a). [Gk. Tcrinon, lily; 

 eidos, form.] = Crinpids = Pinnigrada =Fea- 

 ther-stars : a division of Echinodermata. 

 Animals with a cup-like body and five arms, 

 fixed by a stalk to the sea bottom. 



Crisium=Mare crisium ; one of the level por- 

 tions of the moon's surface; supposed to have 

 been a sea, about 350 by 280 miles in. extent. 



Crith, (krith). [Gk. krithe, barley: a barley- 

 corn. ]= '09 of a gramme nearly; the weight 

 of one litre of hydrogen at the freezing-point 

 of water when the barometer is at 7(5 centi- 

 metres. Used as a standard for the measure- 

 ment of gases by weight. 



Crithmum, (krith'mum)=Samphire; a plant 

 belonging to Apiacese. 



Critical angle. The angle of incidence at 

 which a ray of light passes along the common 

 surface of two media. If the angle be less 

 than this, the ray is refracted through the 

 second medium; if it be greater, the ray is 

 totally reflected, and returns through the 

 first medium. 



Crocodile, ( krok'o-dil ). [ Krokodeilos, the 

 Greek name. ] = 

 Lacerta crocodi- 

 lus. v.Crocodilia. 



Crocodilia, (krok- 

 o-di'li-a). [Croc- 

 odile,2.v.]=Croc- 

 odiles, alligators, 

 &c.: a division of 

 carnivorous rep- 

 tiles, having a 

 covering of horny 

 scales and bony Crocodile, 



skutes; on river banks in Asia and Africa; 

 found fossil in Lower Tertiary. 



Croconic acid, (kro-kon'ik). [Gk. l-rokos, saf- 

 fron.] = C^R^OS : an organic acid, named 

 from its yellow colour. 



Crocus, (krS'kus). [Krokos, the Greek name.] 

 A stemless plant belonging to Iridacese. 



Cromlech, 



Cromlech, (kromlek). , [W. crom, bent; llech, 

 flat stone.] An 

 ancient erection 

 of a flat stone 

 supported by two 

 others set up end- 

 ways. 



Crop, (krop). [The 

 A.-S. word.] A 

 dilation of the 

 gullet in birds, 

 forming a kind 

 of pouch. 



Cross-bedding, v. Bedding. 



Cross-bills, (kros'bilz)=Loxiada3: a family of 

 birds belonging to 

 Conirostres. 



Cross-wort, ( kros'- 

 wurt)=Galium cru- 

 ciata: a plant be- 

 longing to Rubia- 

 cese. 



Crossopterygidae, 

 (kros - sop - ter - ij ' i- 

 de). [Gk. krossotos, 

 fringe; pteryx, fin.] 

 A group of fishes, Cross-bill 



remains of which are found in Old Red 

 Sandstone. 



Crotalaria, (kro-ta-la'ri-a). [Gk. krotalon, 

 rattle.] A plant belonging to FabaceaB, 

 named from the rattling noise made by its 

 fruit in the wind. C. jwnce=Bengal hemp. 



Crotalidae, (kro-taJ'i-de). [Crotalus, 9.1;.]= 

 Rattlesnakes : venomous snakes, mostly 

 American. 



Crotalus, (krot'a-lus). [Gk. krotalon, rattle.] 

 = Rattlesnake: a venomous snake, found only 

 in America, whose tail terminates in a num- 

 ber of bony articulations, which make a 

 sound like a rattle. 



Croton oil, (kro'ton.) An oil obtained from 

 the seeds of Croton tiglium. 



Crotonic acid, (kro-ton'ik). [Croton oil, q.v.] 

 =C4HgO2 : an acid obtained from croton 

 oil. 



Crotonylene, (kro-ton'i-len). [Croton oil, q.v.] 

 =CH.Q'. one of the acetylene series of hydro- 

 carbons. 



Crow, (kr5). [Crawe, the A.-S. name.]=Cor- 

 vus, q.v. 



Crowberries, (kro'ber-riz)=Empetracea9. q.v. 



Crowfoots, (kro'fotz). = Ranuucnlaceas, g.v. 

 Plants belonging to Exogens, but approxi- 

 mating to Endogens. 



Crowned crane, v. Balearica, q.v. 



( krown'wurtz )=Malesherbia- 



Crown -worts, 



ceae, q.v. 

 Crown-wheel. 



of the rim. 

 Crows, (kroz). 



Having teeth cut on the edge 



[Crow, q.v.]=Corvidfe, q.v. 

 Crucible, (kr6o'si-bl). [Crucibulum, the Latin 



word.] Vessels for melting metals, &c. ; made 



to endure great heat without damage. 

 Cruciferae, ( kroo-sif e-re ). [L. crux, cross; 



fero, I bear.j=Crucifers=Cabbages, &c.= 



Brassicaceae, q,v. 

 Crura cerebri, (kru'ra ser'e-bri). [L. crus, 



trunk; cerebrum, q.v.] Bundles of fibres at 



