ata^ suliuzay and hisca ; and that no intercalation 
can take place in the first, the third, the seventh, 
or the ninth year. These coincidences are ren- 
dered evident by the three concentric circles in 
the third figure. The first circle, which is the 
innermost, indicates the signs of the moons, or 
sunas ; the second circle, that in the middle, 
shows in what Muysca year of twenty sunas one 
of the signs contained in the series of ten terms 
becomes intercalary ; and finally the external 
circle determines the number of the intercalati- 
ons, which have taken place in thirty-seven 
years. For instance, if it be asked in what zo- 
cam the sign bosa was intercalated, we find, that 
♦ 
this intercalation was the sixth, or that it was 
made in the twelfth year of the cycle. 
Mr. Duquesne, guided by the Indians, who 
have preserved some knowledge of the signs of 
the Muysca calendar, thinks, that he recognises 
on three faces of the stone the intercalations 
of ata, suhusa, and hisca ; that is to say those 
which take place in nine years of twelve and 
thirteen simas, which correspond to the sixth, 
eighth, and tenth Muysca year of twenty sunas. 
I am ignorant why the first two intercalations, 
those of cuhupqua and muyhica^ are not marked. 
The following is his interpretation, often some- 
what arbitrary, of the 1st and 2d figures. 
The frog without a head, a, denotes, that the 
indiction begins by the sign ata^ the emblem of 
