A Survey of Ancient Peruvian Art. 387 



up to about 1000 A. D. This date, however, does not fit well with 

 loiown historical facts. Let us, then, say that the Amauta 

 "dynasty" (perhaps of Tiahuanaco II) flourished from about 

 200-900 A. D. Montesinos calls the dark period that followed the 

 Amauta "dynasty" the "Tampu Tocco period." In it we may 

 see our Colla-Chulpa period. He gives it twenty-seven rulers. 

 Let us call it ten ; 10 X 27 = 270 years ; or, to put it differently, 

 the dark period began to draw to a close about 1170 A. D. This 

 brings us, to the threshold of the Inca period. The late Dr. 

 Gonzalez de la Rosa constructed a date-chronology of the Inca 

 period which seems to the writer wholly acceptable. A modified 

 version of it is given here. 



10 



Reigns of the Incas, According to 

 Dr. Gonzalez de la Rosa. 



Sinchi Rocca 1 134-1197 



Lloque Yupanqui 1 197-1246 



Mayta Capac 1246-1276 



Capac Yupanqui 1276-1321 



Inca Rocca 1321-1348 



Yahuar Huaccac 134&-1370 



Viracocha 1370-1425 



Pachacutec 1425-1478 



Tupac Yupanqui 1478-1488 



Huayna Capac * 1488-1525 



It may be more satisfactory to some to reduce the thing to 

 round numbers, thus : Viracocha, 1370- 1420; Pachacutec, 1420- 

 1480; Tupac Yupanqui, 1480-1490; Huayna Capac, 1490-1525. 

 Either step will result in a fairly accurate basis on which to fix 

 one's idea of the reign-periods. 



So much, then, for one of our two criteria. It has been noted 

 that this one concerns the mountain region primarily. The other 

 is important for the coast cultures. It is unfortunate that it 

 has not yet been fully studied. 



The islands off the coast of Peru have long been famous for 

 their deposits of guano. These lie in masses of enormous thick- 

 ness. Markham says that two and one-half feet a century is 

 approximately the rate of accumulation. The rate no doubt 

 fluctuated slightly, but the careful investigations made by Mark- 



Gonzalez de la Rosa, 1909; Means, 1917, p. 2^\- 



