HET 



HEU 



style is single, of the length of the sta- 

 mina, and terminated with a single stig- 

 ma. The seed vessel is sometimes a 

 berry, sometimes a capsule, and some- 

 times a stone. 



HESPERIS, in botany, English rocket, 

 or dames violet, a genus of the Tetrady na- 

 mia Siliquosa class and order. Natural 

 order of Siliquosse. Cruciformes, Tourne- 

 fort. Cruciferae, Jussieu. Essential cha- 

 racter : petals bent obliquely: a gland 

 \vithintheshorterstamens; silique stiff; 

 stigma with a forked base, and converg- 

 ing tip ; calyx closed. There are seven 

 species. These plants are much culti- 

 vated for the great fragrancy of the flow- 

 ers : the ladies in Germany have pots of 

 it placed in their apartments, whence 

 it obtained the name of dames violet. 



HETEROCLITE, among grammarians, 

 one of the three variations in irregular 

 nouns, and defined by Mr. Ruddiman, a 

 noun that varies in declension. Other 

 grammarians take the word heteroclite in 

 a larger sense, applying it to all irregular 

 nouns. 



HETEROGENOUS, or HETEROGEWEAL, 

 something that consists of parts of dissi- 

 milar kinds, in opposition to homoge- 

 neous. 



HETEROGENEOUS, in mechanics, such 

 bodies whose density is unequal in dif- 

 ferent parts of their bulk ; or they are 

 such whose gravities in different parts 

 are not proportionable to the bulks there- 

 of; whereas bodies equally dense or so- 

 lid in every part, or whose gravity is 

 proportionable to their bulk, are said to 

 be homogeneous. 



HETEROGENEOUS light, is, by Sir Isaac 

 Newton, said to be that which consists of 

 rays of different degrees of refrangibility : 

 thus the common light of the sun or 

 clouds is heterogeneous ; being a mixture 

 of all sorts of rays. 



HETEROGENEOUS nouns, one of the 

 three variations in irregular nouns; or 

 such as are of one gender in the singular 

 number, and of another in the plural. 

 Heterogenenous, under which are com- 

 prehended mixed nouns, are six-fold. 

 1. Those which are of the masculine 

 gender in the singular number, and neu- 

 ter in the plural. 2. Those which are 

 masculine in the singular number, but 

 masculine and neuter in the plural. 3. 

 Such as are feminine in the singular 

 number, but neuter in the plural. 4. 

 Such nouns as are neuter in the singular 

 number, but masculine in the plural. 5. 

 Such as are neuter in the singular, but 

 neuter and masculine in the plural. 6. 



Such as are neuter in the singular, but 

 feminine in the plural number. 



HETEROGENEOUS numbers, mixed num- 

 bers consisting of integers and frac- 

 tions. 



HETEROGENEOUS quantities, are those 

 which are of such different kinds, as that 

 one of them, taken any number of times, 

 never equals or exceeds the other. 



HETEROGENEOUS surds, are such as 

 have different radical signs, as %/ a a, &/ 



bb, V 9 'V I8 > & c- See SURD. 



If the indices of the powers of the hete- 

 rogeneous surds be divided by their 

 greatest common divisor, and the quo- 

 tients be set under the dividends; and 

 those indices be multiplied crosswise by 

 each other's quotients ; and before the 

 products be set the common radical sign, 

 v/, with its proper index ; and if the pow- 

 ers of the given roots be involved alter- 

 nately, according to the index of each 

 other's quotient, and the common radical 

 sign be prefixed before those products, 

 then will those two surds be reduced to 

 others, having but one common radica 

 sign. 



HETEROSCII, in geography, a term 

 of relation denoting such inhabitants of 

 the earth as have their shadows falling 

 but one way, as those who live between 

 the tropics and polar circles, whose sha- 

 dows at noon, in north latitude, are al- 

 ways to the northward ; and in south lati- 

 tude, to the southward. Thus we, who 

 inhabit the northern temperate zone, are 

 heteroscii with regard to those who in- 

 habit the southern temperate zone, and 

 they are heteroscii with respect to us. 

 Hence it follows, that only the inhabitants 

 of the two temperate zones are heteros- 

 cii, though in reality ; there is always one 

 part of the torrid zone, whose inhabitants 

 are heteroscii with respect to those of the 

 rest, and with regard .to those of one of 

 the temperate zones, except at the time 

 of the solstice, and even at this time all 

 of the torrid zone are heteroscii with re- 

 gard to those of one of the temperate 

 zones ; but as the people of the torrid 

 zone have their shadows now on this, 

 and then on that side, they are called am- 

 phiscii. 



HEUCHERA, in botany, a genus of 

 the Pentandria Digynia class and order. 

 Natural order of Succulents. Saxifra- 

 gx, Jussieu. Essential character : petal's, 

 five; capsule two-beaked, two-celled.. 

 There are two species, viz. H. americana, 

 American heuchera or sanicle, and Hv 

 dichotomy. 





