J. D. Dana on Serpentine Pseudomorphs, ete. 447 
If we now take the sum of the results, embracing all the 
three territorial groups, it is seen that in the five maxima sets 
of years there is an excess of rainfall three times and a defi- 
ciency twice, and that in the five minima sets of years there 
is a deficiency five times, the result being in entire conformity 
to the supposed law. 
Yet amid these results striking anomalies are found, for in 
the maximum set of years extending from 1814 to 1818, there 
is a deficiency of 31 per cent of the mean; and from 18385 to 
1839, which are maxima years, the three territorial groups all 
present results below the mean, the first giving —°03, the second, 
— ‘60, and the last —-55. 
In view of the results obtained from these two modes of in- 
vestigation, I think we may venture to infer, that so far as trust- 
worthy observations have been made throughout the United 
States, they point to a connection existing between the variations 
in the sun-spot area and those of the annual rainfall, the rain- 
fall tending to rise above the mean when the sun-spot area is in 
excess, and to fall below when there is a deficiency of solar 
activity. 
Art. XLII.—On Serpentine Pseudomorphs, and other kinds, 
from the Tilly Foster Iron Mine, Putnam Co., New York ; by 
JAMES D. Dana. With plates VI and VIL 
[Continued from page 381.] 
5. Pseudomorphs after Chondrodite. 
that it falls to pieces easily when struck with a hammer. 
n the change to serpentine the honey-yellow chondrodite 
some unaltered chondrodite grains being still present, and 
finally smoky blue to dark green. Much o 
Masses in the same rock are wholly serpentine. 
