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V 
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As a strong argument against my opinion of the over-rated importance of 
immigration by causes here spoken of, I must remark that sometimes large 
pieces of bamboos, measuring often 2J feet in circumference, and belonging 
evidently to Bambusa gig ante* , have been met with by me not only along 
the eastern but also along the western coasts. This makes it probable that 
they have come from the direction of the sources of the Irrawaddee, north of 
these islands. The length of time, however, these woods have travelled to 
reach the Andamans cannot be made out, as we possess no knowledge of the 
preservation of bamboo in sea-water. 
It may also he presumed that the decaying of vegetable matter and the 
power of seeds to retain vitality must differ in different climates. Hence it is 
that temperate species become acclimatized so easily even in tropical coun¬ 
tries, while tropical species rarely enter into the temperate zone. 
The following are some examples of centres, as far as I remember. I 
understood the distribution of the plants on the Andamans only after having 
traversed several entire tracts of these islands, and therefore the data 
are very meagre. I must remark that I do not include such species as 
are new to science, or are restricted to a few specimens, but only such whose 
frequency and nature of occurrence allow me to call them centres. 
Mesua ferrea around Aberdeen and opposite and around Mount 
Harriet as the second prevalent type of the forests there.— Sandstone, 
JELarrisonia (Brownei ?) at Bird-nest Cape only.— Serpentine rocks. 
Leea acuminata ? Wall, north of Mangrove Bay and Watering Cove.— 
Indurated chloritic rock. 
i 
Carapa Moluccensis , shores north of Port Mouat.— Sandstone. 
Bteroloma triquetrum , north of Watering Cove in bamboo jungles.— In¬ 
durated chloritic rocks. 
Melastoma (Malabaricum ?) ridge near South Point.— Sandstone. 
Sonerila sp.? rocky places, north of Watering Cove.— Indurated chloritic 
rock. 
Lumnitzera racemosa : Middle Andaman at Middle Straits.— Indurated 
chloritic rock. 
Begonia Andamanensis , Parish, on a ridge at Port Mouat.— Sandstone. 
Mcesa ramentacea , Viper Island.— Sandstone. 
Bassia caloneura , north of Watering Cove.— Indurated chloritic rocks. 
Acanthus ebracteatus , Phoenix Bay (Sandstone) ; Middle Andaman (In¬ 
durated chloritic rock ); Port Mouat (Sandstonej. 
Ebermaiera velutina , on a ridge at Port Mouat.— Sandstone. 
Clerodendron squamatum , Vlil., north of Watering Cove.— Indurated 
chloritic rock. 
Cassytha filiformis, Shoal Bay and Crab Island.— Sandstone. 
Euphorbia Atoto, Macpherson’s Straits and South Point.— Serpentine 
rocks. 
•- epiphylloides , Escape Bay.— Serpentine rock. 
-- trigo?ia i South Corbyn’s Cove.— Serpentine rock. 
Mcuala paludosa , Middle Straits.— Indurated chloritic rock and Sand¬ 
stone. 
Corypha macropoda , Termoklee Island.— Indurated chloritic rock. 
Tacca pinnatifida, Crab Island.— Sandstone. 
Beristylus ? on a ridge at Port Mouat.— Sandstone . 
Ancectochilus ? South Corbvn’s Cove.— Sandstone ? 
