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posed to the air, cooling sooner than the centre. The move- 
ment of the successive strata might afterwards have displaced 
the upper fragments, giving to the whole its present aspect. 
Should this be a mistake, it is, however, that which naturally 
occurs on seeing the Monapostiac, and its regular formation 
appears difficult of explanation in any other way. 
The idols which were found in this island are of terracota, 
and have been deposited in the national museum of Mexico. 
Their character is very different from those made by the Az- 
tecs, and some of them are not without artistical merit. Un- 
fortunately during their removal the best were broken in such 
a manner as to prevent the possibility of joining the frag- 
ments. 
It was asserted that the island of Tilema possesses also 
several objects of archasological interest, and that in the island 
of Arrianjianbaj, which signifies old city, the remains of an 
abandoned small town are still to be seen. 
