

206 “THE NATURAL HISTORY 
§ ». 
are an article of commerce, and, it is faid, that dhe 


vs 
Dutch export every year from Batavia 12 5,000lb.* 
or between 50 and 60 tons weight of thefe nelts 
Some writers fuppofe, that they are com-— 
_ pofed of fea worms, of the Mollufca tribe ; fome 
of a kind of cuttle fith, and others of a ie : 
_ plant, called Agal Agal. | 
Mr. Marfden fays, that the Swallows that make 
thefe nefts, are about the fize of a Martin, and 
that they collec with their bills from the foam of 
_ the fea, the materials with. which ats make their 
neits,. 
Tuz 1S ae ies Sees mera Ege 2 
The tail: feathers are without {pots. The upper part of 
the body, wings, and tail, blackith, gloffed with blue; whits 
beneath; ,and the extreme part of the body at the dake. on 
of the tail, white. , 
The Martin builds its neft againit: the yi of 
_ cliffs that’overhang the fea,. but more frequently 
3 ly q 
under the eaves, under cornices, in the upper cor 
ners of windows, or under any other. projecting parts: 
ofhoufes. The materials that it employs are very 
fimilar to thofe ufed by the Swallows,, viz. earth 
on the outfide, particularly that which has beem 
thrown up by- worms, tempered, and mixed with) 
Craw; and lined-with feathers.. There is, how- 
= evel, 

