Sentence:  In the meantime, while the daily newspapers of New York are talking over their "Aztec race" the Academy of Sciences at Paris has its grave announcement in a communication from M. de Castelnan, a duplicate of which we find in the Bulletic of the 'Socièté  de Geographie respecting the NIAM-NIAMS, a people of Central Africa, to the southwest of the Lake Tchad, a people of whom there have been some scattered rumors before, suggesting to a modern Monboddo a " theory of <WSD>caudation</WSD>," in fact a people wearing indisputable natural tails. 
Meaning of the word marked with <WSD> tags:  The property of having a caudate extension or tail.