56 



A GLOSSARY OF TERMS 



ly at a right-angle from anything, 

 as branches from a stem. 



DIVE' RGING. ") When the structure 



DIVE'RGENT. 3 of a mineral is 

 fibrous, and the fibres are not 

 parallel, they usually diverge. 

 Tending to various directions or 

 parts from one point. 



DIVERTI'CULUM. Lat. A by-road : 

 Applied to a blind tube branch- 

 ing out from the course of a longer 

 one. 



DoDECAGY'NiA.-fr.gr.</o?eea, twelve; 

 gune, pistil. Name of an order 

 of plants. 



DoDECA'inmiA.-fr.gr.rforfeca, twelve; 

 aner, stamen. Name of a class 

 of plants. 



I)OE. A female deer. 



DOKIMA'STJC AHT. fr. gr. dokimazo, 

 to prove by trial. The art of as- 

 saying minerals and ores, in order 

 to determine the quantity of me- 

 tal which they contain. 



DOLA'BELLA. Lat. A little axe. 

 Name of a genus of gastero- 

 pods. 



DOLAB'RIFORM fr. lat. dolabra, an 

 axe ; forma, form. Axe-shaped ; 

 applied to a form of leaf. 



DO'LERITE. One of the varieties of 

 the trap rocks. 



DOLICHODE'IRUS. fr. gr. dolichos, 

 long; deire, neck. Long-necked, 

 (p. 57, Book viii). 



DOLI'CHONYX. fr. gr. dolichos, long ; 

 onux, a nail, a claw. Generic 

 name of the rice bird. 



DO'LIUJVT. Lat. A tun or tub. Name 

 of a genus of gasteropods. 



DO'LOMITK. Named after Dolomieu. 

 Magnesian marble: granular mag- 

 nesian carbonate of lime. Itco"n- 

 tains about 45 per cent, of carbo- 

 nate of magnesia. It is com- 

 monly more friable or crumbling 

 than pure limestone, and less du- 

 rable as a building material. 



DOLOMISA'TIOTT. The conversion of 

 common, into magnesian lime- 

 stone or dolomite, (p. 170, Book 

 viii). 



DOME. fr. lat. domus, house. A 

 rounded projection. 



DO'MITE. A tra'chytic rock. (p. 171, 

 Book viii). 



DOMES'TICA. ) Lat. Domestic; re 



DOMES'TICUS. $ lating to home. 



DO'NACES. Lat. plur. of Donax. 



DO'NAX. Lat. and Gr. an arrow. 

 Name of a genus of mollusks of 

 the family of chama'cea. (p. 84, 

 Book v). 



DORCAS. Gr. A gazel. 



DO'RIS. A sea goddess, the daugh- 

 ter of Ocean and Thetys. Name 

 of a genus of nudibranch gastero- 

 pods. (p. 65, Book v).' 



DORMOUSE. fr. lat. dormire, to sleep j 

 mus, a mouse. A mammal. 



DO'RSAL. fr. lat. dorsum, the back. 

 Belonging or relating to the back. 



DOR'SIBRANCH. ) Havingdorsal 



DOR'SIBRAN'CHIATE. branchiae or 

 gills. Relating todor'sibranchia'ta. 



DOR'SIBRAJTCHIA'TA. fr. lat. dorsum, 

 back ; branchiae, gills. An order 

 of annelidans. 



DOR'SUM. In conchology, the upper 

 surface of the body of the shell, 

 when laid upon the aperture or 

 opening. 



DOTTED. Punctured like a thimble. 



DOWK. fr. Danish, duun. Soft wool, 

 or tender hair ; fur. Soft feathers. 



DRIFT. Superficial deposits of wa- 

 ter-worn, transported materials, 

 consisting of gravel, boulders, 

 sand, &c. (p. 92, Book viii). 



DROMEDA'RIUS. Lat, fr. gr. dromos, a 

 race, speed. The dromedary; a 

 species of camel with one hump, 

 thus named from its swiftness. 



DRUPA'CEOUS. Bearing, or resem 

 bling drupes. 



DRUPE. fr. lat. drupce, unripe olives. 

 A pulpy fruit, without a valve or 

 outward opening, containing a 

 bony nut, as the cherry. 



DRUSES. Cavities whose interior 

 surface is lined with crystals. 



DRUST. fr. ger. druse, a gland. Ap- 

 plied to a mineral when its sur- 

 face is composed of small prom- 



