500 Construction of Maps in Geographical Botany. 



mencing as I have numbered them, 1 will stand for Europe ; 

 2, for Asia ; and so on. 



All the families occupying each section should be detailed, 

 whether large or small; but in that division where a family 

 prevails, and where it may be said essentially to belong, some 

 distinctive mark should be attached to its name, as by having 

 the commencing letter in a different type from the remainder 

 the word. The more prominent genera in each division may 

 be placed under the name of their natural family, unless better 

 placed elsewhere ; so that the type, under which a family ap- 

 pears in each division, may be immediately shown. The 

 following examples will place this in a clearer view : — 



Europe. 



'oirruiXcEiE 



ZYtiOPHY'LLEiE 



Asia. 



PortulaYe* 



ZYGOPHY'LLEjE 



Fagbnia 



© 



Africa. 



PortulaYe* 

 Anacampserc 

 Gingfnsia 



Zygophy'lle/b 

 Melianthus 



© 



HlPPOCASTA^NEffi L A 



JE sculus V / 



[The author had placed the remainder of the diagrams in lateral continuation of thcprecceding 

 ones ; the limited width of our page renders it more convenient to us to present them thus.] 



North America. 



PoimuVcEiE 

 C'laytbnia 



Zygophy hhEM 



© 



© 



South America. 

 Calandrinia t" J 



Australia. 



PortulaYejE f \ 

 Aylnnria r "* 



ZYGOPHY'LLEaS 



Guaiacum 

 Larrea 



© 



Zygophy'llejE 



© 



IJ 1PPOCASTA x NEjE 



Pavia 



^E'sculus 



As to genera, their distribution is a subject of great im- 

 portance, and should receive corresponding attention. To 

 prevent the crowding of explanatory sentences, a line may be 

 passed through the name of the genus, stretching north and 

 south to the extent of its limits ; or a portion of a circle may 

 be made to sweep through the same extent. If its course in 

 the direction of the latitude is interesting, this might be ex- 

 pressed by lines, parallel, converging, or diverging, according 

 to its habitat, running to the perpendicular line as a base. 

 A great number of these lines might be inserted in a map, 

 and each may be perfectly distinct. 



One of the chief objects of this study being the determin- 

 ation of the limits and circumstances under which man may 



