1816.) Humboldt’s, &c. Planis of South America. 375 
Ratio of each 
Number of Species in | Family to the whole 
in 
Natural Families. ' 
Lap- | | Ger- | Lap- 
Ger- 
France.| many, ; land, | France. |many.| land. 
Cyperoide ............| 134 | 102 | 55] BW } a] 2 
Gramine®: ...........485 284°) 143,49} Ee ee | 
Juncee..... oS alee sve]. AQibe2Obs 2Oge shotha. | 1. 
Three preceding families ..| 460 | 265 | 124} 2 aed. 
EMITHCE 5.5 5.0 eigen bites 54 | 44 ll ee Pee) ee 
MEGS, OG aisioie a wia’g Bie ae 149 | 72 Cb ste bate iy 
Rhinanthee et Scrofularie.| 147 | 76 Am ages es al 
Boraginee ......6+..+.| 49°} 26 6] 2 La oh Gee 
Brice et Rhododendra ..| 29} 21}. 20} 71. tid be 
Compositee:... 0... sf 5-» .| 490 | 233 | 38) 2 ene gee 
NRTRCIMICTOS ors «cpg pic's: Ah Od Sy A RE i a es 8 
i amet] OO: OG fA a Pe |e 
Malvaces#o.". 2... 0066. 6. 25 § Deere ae f.O 
Caryophyllee ........../ 165) 71) 2] 2 |} }] a 
Leguminose .....+.....| 230} 96) 14) 2 ta} a 
Euphorbia ..........4. BL kidd Bld pete. 
Amentacee ......--.. of 69h AB ue PBillked fegles bake 
adi ae eee ae 19 7 a eee See ve ides 
Phanerogamous ...... .. |3645 (1884 | 497 0 010 
France lies between latitude 421° and 51°. The mean tempera- 
ture of the year is 62°—52°. Mean temperature of the summer 
75°—66°. The months in which the heat exceeds 51 are March— 
November, May—September. . 
Germany lies between latitude 46° and 54°. The mean tempe- 
rature of the year is 54°—471°, The mean of summer is 70°—64°, 
The months in which the temperature exceeds 51° are April— 
October, May—September. 
Lapland lies between latitudes 64° and 71°. The mean tempera- 
ture of the year is from 34°—17°. The mean temperature of 
summer is 55°—45°. The months in which the temperature 
exceeds 51° are June—August, June—July. 
The following is the distribution of the natural families in the 
temperate zone of North America, according to the Flora of 
Pursh :— 
