REV. R. BARON ON THE FLORA OF MADAGASCAR. 257 
the River Andrahona, the divisions will be complete. All 
the territory to the west of the limits thus defined, with the 
island of Nosibé and all others near the mainland, constitute the 
Western Region, and that to the east the Eastern. Of course it 
is not pretended that these Regions can be defined with great 
accuracy, the divisions in the extreme north and south of the 
island between the Eastern and Western Regions, where they 
come in contact, being almost arbitrary. To what points north 
and south the Central Region should extend is also somewhat 
uncertain. "The limits, however, of the three divisions as thus 
defined may be accepted as substantially correct. Inasmuch as 
these Regions range through about thirteen degrees of latitude 
(the Eastern and Western Regions being chiefly, and the Central 
entirely within the tropies), there must necessarily be consider- 
able variation in the character of the vegetation in a northerly 
and southerly direction, but the variation is gradual and by no 
means so marked or distinct as it is in an easterly and westerly 
direction. 
A few general figures (particulars will be given further on) 
will show that this division into Eastern, Central, and Western 
Regions is fair and natural. Of the 3178 species of plants 
whose localities I have been able to determine, there are :— 
Common to the three Regions sns. 100 
» » Eastern and Central Regions .... 190 
» " Western and Central  ,, .. 74 
» » Eastern and Western  ,, .. 128 
Peculiar to the Eastern Region .............. 1108 
Not peculiar to E. Region, but occurring in it .. 418 
Total in the Eastern Region .... 1526 
Peculiar to the Central Region ................ 872 
Not peculiar to C. Region, but occurring in it.... 364 
Total in the Central Region .... 1236 
Peculiar to the Western Region......... TD" 706 
Not peculiar to W. Region, but occurring in it.... 302 
Total in the Western Region.... 1008 
