CAT SUPPLEMENT. CEP 



petals of a flower held together by stamens above mentioned are made : they are called 



growing to their bases ; exemplified in the artificial cements. 



mallow. CEMENTS ROMAN, the Roman cementa 



CATAPHRACTED, covered with hard bony are obtained by calcinating natural stones, 

 or horuy plates or callous skill closely from which cements similar in constituents 

 jointed. and proportions to the Portland cements 



CATAFHRACTI, or Equites Cataphracti, may then be made, but distinguished from, 

 the name given to ancient cavalry covered the latter by being called natural cements. 

 with complete suits of defensive armour. | CENOBIO, a regular fruit, the acephalous 



CATAPULT, an ingenious but mischievous pericarps of which are not marked at their 

 adaptation of the elas.icity of vulcanised summit by the ordinary stigmatic scar, iu 

 india-rubber, by which a substitute for the consequence of the style being connected 

 ordinary sling has been produced, easy of with their base. 



construction, and very dangerous in thej CENOTAPH, a tomb or monument erected 

 hands of boys or unprincipled persons. It : to the memory of some one whose body hag 

 throws stones with great force and accuracy, not been found for burial, or has been 

 and might be utilised advantageously where interred elsewhere. 



no other weapon of equal power is at! CENTRAL SUN. The sun of our system and 

 command. I all the fixed stars, so far as observation has 



CATEGOREMATIC, a word capable of use in ! been able to determine, have direct motions 

 Itself as a term in logic, or as a predicate, > In addition to any orbital motions they may 



i so called. 



CATHARTIC, medicines which act upon the 

 towels. Mild cathartics are those which are 

 less severely purgative. Cathartics of a 

 drastic character are those violent purga- 

 tives, such as croton oil, which can only be 

 justifiably employed in very extreme and 

 exceptional circumstances, unless greatly 

 diluted. 



CATOPTROMANCT, divination by mirrors. 



CACDA EQUINA, the origin or roots of 

 terminal spinal nerves contained in the 

 neural canal of the vertebrae, surrounding 

 the filum terminate of the myelon. 



CAVENDISH EXPERIMENT, a mechanical 

 contrivance for determining the mean 

 density of the earth by means of the balance 



have in relation to the primaries or second* 

 aries of their own particular systems ; and 

 M. Madler, of Dorpat, has endeavoured to 

 assign these direct motions to immense orbits 

 described by them round some commoa 

 centre. It is certain that all completely 

 ascertained astronomical motions are of an 

 orbital character; and even the parabolic 

 and hyperbolic comets may have only ex- 

 tremely elongated motions of this character 

 round, not our sun, but a greater and more 

 remote central body. M. Madler has con- 

 cluded that the central sun with reference 

 to our system Is Alcyone, 7) Tauri, the 

 brightest star of the Pleiades ; and assuming 

 this star to be as far from 61 Cygni as the 

 is, and adopting the parallax of 61 



of torsion. The suggestion appears to have C ygni as announced by Bessel, he concludes 

 first originated with the Rev. Jonn Mitchell, th | mean semidiameter of our sun's orbit 

 though first carried out by Henry Cavendish. round Alcyone to be abou t 34 millions of 



See his report in the " Philosophical Trans- 

 actions " for 1793. 



times as great as the earth's mean distance 

 from the sun. This enormous orbit our sun 



CAVICORNIA, a tribe of Cavicorn Rumi- cannot traverse in less than eighteen mil- 

 nnnts, including, as Hie name implies, those i ions two hundred thousand years even at 

 with hollowed out horns growing on bony !the Te iocity, at which it is proceeding, of 

 processes of the frontal bone, such as the one hundred and eight thousand miles per 

 antelopes. | hour 



CEDRIKET, a crystalline body of a reddish. CENTURIATORS OF MAGDEBURG, the 

 orange colour found in creosote. | name ailop ted by certain historical Lutheran 



CELLULOSE, the matter of which the cell write rs at Magdebuiy, who compiled a great 

 walls and vascular tissue of plants are com- work on Clmr eh History from the earliest 

 posed. It is chemically inactive and very, times to the period of the Reformatio 



insoluble. 



CEPHALANTHIUM, the capitate inflores- 



CKMKN-TS HYDRAULIC, carbonate of lime ' cenw O r head of a composite plant, 

 and silicate of alumina in varying propor- 1 CKPHALITIS, innamnmtiou u f the brain, 

 tions. of from about 36 to 84 of the former CEPHALIUM a woolly peculiar mass 

 and 16 to 64 of the latter, form a cement ! w hich erows at the apex of the stem, and 

 which sets very quickly under, and in- out of "which the flowers of the JMocmXw 

 creases in hardness from, the action of lime. 



CEPHALOTHOUAX, the first segment of 



water. 



CEMENTS PORTLAND, the Portland ce- 

 ments are obtained artificially by the calci- 

 nation of a mixture of chalk and clay, from 



crustaceans and arachniduns. 



CKi'HAi.omr.M, synonymous with Tuber- 

 treatises on the lichens. It sig- 



which artificial cements of the constituents ' n j ne s a convex shield like figure without au 

 and proportions of the hydraulic cements elevated rim. 



771 3 D 8 



