744 Human Remains found near the City of Mexico, (August 
the object of quarrying building stone, and this will allow in the 
course of time some other data to be discovered which will 
clearly mark the geological age of the event; a tooth of a mas- 
todon or an object of the present age would at once be the land- 
mark assigning it a fixed page in the history of the earth. The 
authenticity of the fossil is not only determined by the report of 
Sefior Obregon and the identity of the rock which contains the 
remains with the blocks that are being at present quarried at the 
foot of the hill, but I, myself, have determined this authenticity, 
having found part of the human remains still imbedded in the 
ground rock. ; 
I will conclude by mentioning other facts that indicate the an- 
tiquity of man in the valley of Mexico. Twelve years ago, in 
executing some works for the drainage of the valley, in the direc- 
tion of Tequisquiac, numerous deposits were discovered belong- 
ing to Quaternary animals, such as elephants, mastodons, glypto- 
dons, etc., and among one of these deposits a fossil bone was 
found carved by human hand and imitating an animal’s head. 
Unfortunately no care was taken to determine if it was found 
simultaneously with the bones of the Quaternary animals. The 
appearance of the carved bone and of the cuts and incisions 
which it has, denote a remarkable antiquity, and it has character- 
istics of fossilization. Two years ago I discovered some remains 
of ancient ceramics in the pumice tufa which is under the basaltic 
lava formation found in the south-eastern part of the valley of 
Mexico; the lava occupies a large area, and in some points its 
thickness i is over two meters. No tradition makes any mention 
of this volcanic cataclysm before the existence of man in the 
valley of Mexico. 
These are, at present, all the data I can give relative to the 
man del Peñon. - On my return to Mexico I will continue with a 
further investigation of the ground where the discovery was 
made, and will communicate anything new that may be found, in 
order to determine the sar kee importance which these 
uman remains may have. 
