EX P 



310 



EXT 



eye pr 

 that the eyelid cannot cover it. 



EXOPHYL'LOUS, |, and <puA>.e, leaf. 

 Applied to the young leaves of exogens. 



EXOP'TILES, ( |, and vrtlts, feather. A 

 term for dicotyledonous plants. 



EX'OSMOSE, Gr. from |J, and virfttf, 

 impulsion. The passage outward from 

 within, of gases, &c., through porous 

 membranes. 



ExosTo'sis.from t. and erTwv, a bone. 

 A term in surgery and botany for any osse- 

 ous or knotty excrescence. 



EXOTE'RIC, from iiort(6s, exterior. 

 External, opposed to esoteric, internal. 

 The exoteric doctrines of the ancient phi- 

 losophers were openly professed and 

 taught ; the esoteric were secret, and 

 taught only to a few. 



EXPANSION, from expansum The In- 

 crease of bulk which a body undergoes by 

 the recession of its particles from one 

 another, so that it occupies a greater 

 space, while its weight remains the same. 

 Expansion is one of the most general ef- 

 fects of heat, being common to all bodies 

 whatever, whether solid, liquid, or ga- 

 seous. 



EXPAN'SIVE EX'GINE, a steam engine in 

 which the expansive power of steam is 

 taken advantage of and employed, instead 

 of being dismissed at full power into the 

 air or condenser. The steam is cut off be- 

 fore the end of the stroke, which is finished 

 by the expansion of the steam which was 

 let into the cylinder. There are also- en- 

 pines in which there are two steam cylin- 

 ders employed, both connected to the same 

 beam : in one the steam works at full 

 force, and is afterwards discharged into 

 the other, which is of a larger size, where 

 it acts a second time by its expansive 

 force. 



EX-PAH'TE (Lat. for partly). A term 

 used in the Court of Chancery, when a 

 commission is taken out and executed by 

 one side or party only, upon the other 

 parties refusing or neglecting to join in 

 the same. 



EXPECT'ANT, looking for. An expectant 

 estate is one which is suspended till the 

 determination of some particular estate. 

 Estates of this kind are remainders and 

 recersiont. 



EXPECT A'TIO* , from expecto. 1. In the 

 doctrine of chances, the value of any pro- 

 pect or prize depending upon the hap- 

 pening of some uncertain event. 2. In 



the doctrine of life annuities, the particular 

 number of years which a life of a given 

 age has an equal chance of enjoying, or 

 the term which a person of a given age 

 may justly expect to live. 



EXPERIMENTAL PHILOSOPHY, thOCC 



branches of science, the deductions of 

 which are founded on experiment or trial, 



as contrasted with the moral, mathema- 

 tical, and reflective branches. 



EXPERIMEN'TUM CRCCIS (Latin) , a lead- 

 Ing or decisive experiment. 



EXPLORATION, from explore. A term in 

 medicine for the investigation of the phy- 

 sical signs of a disease, as opposed to the 

 diagnosis derived from symptoms. Ex- 

 ploration is used chiefly in diseases of the 

 thorax and abdomen. 



EXFO'NENT, from expono. In algebra, the 

 exponent or index of a power is the num- 

 ber which expresses the degree of power, 

 or which shows how often a given power 

 may be divided by its root before it be- 

 comes unity.^ Thus 2 is the exponent of 

 2% and 4 of X* = xxxx. 



EXPONENTIAL, from exponent. In ma- 

 thematics, exponential curves are such as 

 partake both of the nature of algebraic 

 and transcendental ones. They consist 

 of a finite number of indeterminate terms, 

 but cannot be algebraically constructed. 

 The exponential theorem is an expansion 



of a' 



where A=l+ { a-1- J (a-l)'+i (a-1)' 



&c. j x + &c. 



Ex POST FACTO, a Latin phrase, used 

 in late to denote something done after 

 another thing that was committed before, 

 and after the time it should have been 

 done. An ex post facto law is one which 

 operates upon a subject not liable to it 

 at the time the law was made. 



EXPRES'SED OIL, an oil obtained by 

 pressing it put of the substance contain - 

 ing it, as olive oil from the olive, almond 

 oil from the almond, &c. 



EXPRES'SION, from expremo. 1. A me- 

 chanical operation by which the juices 

 of plants and various fixed oils are ob- 

 tained. - 2. The indication of the state 

 of the feelings, passions, and sensations, 

 presented by the countenance, attitude. 

 and gesture. - 3. That manner and tone 

 of voice in singing which gives life and 

 reality to ideas and sentiments ; the mo- 

 dulation of voice suited to any particular 

 subject. 



EXSERT'ED, Lat. exeertus, protruding ; 

 applied in botany in opposition to en- 

 closed. 



EX-TIP'UT.ITE, from ex and stipula. A 

 botanical term applied to plants desti- 

 tute of stipules. 



EXTENSION, from extend. A term in 



Csics for that essential property of a 

 y by which it occupies some part of 

 space. Figure is the result of extension. 

 EXTEN'SOR. In anatomy, a muscle 

 which serves to extend any part; the 

 name is opposed to flexor. 

 EXTENT. In law, a writ of execut!o 



