J. P. Kimball on the Silver Mines of Sta. Eulalia, Mexico. 161 
masses broken by the slide. Besides these, there were a few 
well worn boulders of syenite, quartz, and hornblende rock, 
some of which were near the top. 
All the trees that had stood on the ground now occupied by 
the débris of the slide, were carried away or buried up, only a 
very few bare logs remaining in sight. 
Along the sides of the slide the forest was full of uprooted, 
bruised, and broken trees. 
rougher but not as much so as above. 
The appearance of the surface was the same in all parts. 
Its color was a light yellowish brown, and at a little distance it 
closely resembled a field lately ploughed and harrowed. 
It is the contrast of light color with the dark green of the 
spruce forest around it that causes the slide to be so distinctly 
visible at long distances. As is stated above, the upper portion 
of the slide is very steep, but after the first fifty rods the angle 
of inclination is less, and just above the widest part it is not 
more than twenty-five degrees. Below it is not more than 
degrees, 
Art. XX.—On the Silver Mines of Santa Eulalia, State of Chi- 
huahua, Mexico; by JAMES P. Kimpaut, Ph.D. 
Don Jesus Inocente Irigoyen of Cusihuiriachic, a good anti- 
uarian authority, states th 
€ only available official register : , DON 
ever, goes back no further than 1705, but mentions their dis- 
covery in 1703—twelve years after the city of Chihuahua was 
foun according to the date given by Dr. Wislizenus. From 
6 
? . 
ollars of silver per annum. Up to 1791, during 
a period of eighty-six years, their acknowledged production of 
= ; king’s fifth, was paid to the royal 
d supported sixty-tht : 
undred and eighty-cight smelting furnaces of 
1 
an. 2 
. h elting fur 
—SEcoND , Vou. XLIX, No. 146.—Mancs, 1870. 
: 3 
Peedi PN 
