36 



A GLOSSARY OF TERMS 



composed of a succession of equal 

 rings. 



ISOGEO'THERMAL. fr. lat.tsos, equal ; 

 ge, the earth; thermos, heat. Ap- 

 plied to lines which are supposed 

 to pass through all parts of the 

 earth's structure, on the surface, 

 where the mean heat is the 

 same. 



'SOLATKD. fr. it. 'isola, an island. 

 Separated like an island. 



ISOMO'RPHOUS. fr. gr. morphe, form. 

 Having the same form. 



ISOXO'MAL. Under the same law. 

 Applied to crystals in which all 

 the decretions are equal. 



ISO'POD. Of the order Iso'poda. 



ISO'PODA. fr. gr. isos, equal ; pous, 

 foot. An order of crusta'ceans. 



ISOSTE'MONOUS. Applied to those 

 plants whose stamens are equal 

 in number to the petals. 



ISOTHE'RIAL. fr. gr. isos, equal ; the- 

 reios, having the heat of summer. 

 Isotherial lines are supposed to 

 be drawn through all places hav- 

 ing the same mean summer tem- 

 perature. 



ISOTHEH'MAL. fr. gr. isos, equal ; 

 thermos, heat. Isothermal lines 

 are supposed to pass through all 

 places where the mean tempera- 

 ture of the air is the same. 



IS'PIDA. Lat. A kingfisher. 



ISTH'MUS. fr. gr. isthmos, a narrow 

 tongue of land, joining a penin- 

 sula to a continent. Anatomists 

 have given the name isthmus fau- 

 cium, isthmus of the fauces, to 

 the strait or passage between the 

 mouth and pharynx. 



JACULA'TOR. Lat. A shooter; a 

 dart-flinger. Specific name of a 

 shooting-fish. 



JAGGED. In botany, irregularly di- 

 vided and subdivided. 



JANTHI'NA. fr. gr. ianthon, violet 

 colour. A genus of the family of 

 trochoides. (Jig. 54, p. 51, Book v). 



JASMI'NEJE. A family of plants of 

 which the jasmine is the type. 



JASPER. A siliceous mineral of va- 

 rious colours ; sometimes spotted, 

 banded or variegated. It takes a 

 fine polish. 



JOINTS. In geology, the fissures or 

 lines of parting in rocks, often at 

 right-angles to the planes of stra- 

 tification, (p. 187, Book viii). In 

 botany, the places at which the 

 pieces of the stem are articulated 

 with each other. 



JOTA. Sp. The least. Specific 

 name of a vulture. 



JU'GA. Lat. plur. of jugum. In bo- 

 tany, the ridges, or elevated por- 

 tions by which the carpels of um- 

 belliferous plants are traversed. 



Ju'ouLAR.-fr. lat./ttgw/um, the throat. 

 Belonging or relating to the throat. 



JU'GUM. Lat. A yoke. Applied 

 to a pair of opposite leaflets on 

 the petiole of a pinnate leaf. 



JU'LIFORM. Formed like an amen- 

 tum or catkin. 



JuNc'TURE.-The joiningofthe whorl 

 in univalves. 



JURA LIMESTONE. Limestone be- 

 longing to the oolite group, and 

 constituting the chief part of the 

 mountains of Jura. 



JURA'SSIC. Belonging or relating to 

 the Jura mountains. Applied to 

 a system of rocks of the middle 

 secondary geological period. Also 

 termed oolite. 



JUXTAPOSITION. fr. lat. juxta, near 

 to; ponere, to place. The mode 

 of increase, proper to minerals, 

 which is by the successive addi- 

 tion of new matter on the outside 

 of that which already existed. It 

 is opposed to intussusception. 



KA'LIFORM. Formed like iheSalsola 

 Kali, a sea-coast plant. 



KEEL. Carina. The longitudinal 

 prominence in the Argonauta. 



KEH'NEL. Nucleus. 



KEU'PER. Ger. The upper portion 

 of the new red sandstone forma- 

 tion, (p. 52, Book viii). 



KIDNEY - SHAPED. Heart - shaped 



