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ata, suhuza, 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. 1 



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 sunas, 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 



