I22 AMERICAN MIDLAND NATURALIST. 
Size. The specimen is 24.1 centimeters long and 12 centimeters wide, 
with a cireumference of 61 centimeters in the length and 42 centimeters 
in the breadth. 
Shape. As seen from the illustration it is approximately oval, re- 
sembling somewhat an exaggerated oval pebble. 
Hardness. Jasper has a hardness of 7. and Hematite one of 6., aver- 
age 6.5. 
Weight. In air it weighs 6 kilos and in water 4.4 kilos; hence its 
p pec yis ign a(b: 
The rounded form and absence of sharp corners shows 
iu. our dfc was RR De from a distance; and this distance 
must have been considerable judging from the hardness of the 
As this particular kind of rock is found ited in ; 148 native locality Pis 
Lake Superior; and this specimen was found in northern Indiana, the 
obvious conclusion is that it was Dil end to pi latter place by some 
agent. The natural transporting agents are air, water and ice. It must 
have been brought here by ice during the glacial period. Its present 
r ng 
t 
than it is at present. Its companion mineral also much softer during 
its period of transportation and, pea could not reduce the speci- 
men — much by friction and w 
Average composition. The vans gravity of our specimen of Jas- 
perite is Pe 75, hematite has a specific gravity of 5.2 and jasper one of 2.6. 
Knowing these, we deduce the specific gravity for jasperite in the follow- 
ing manner. Adding the specific gravities of jasper and hematite and 
dividing by two we get the mean specific gravity for equal proportions. 
‘ : ve 
roximately a mixture of equal portions of jasper and hematite, with 
a slight increase of the hemati 
shall add here a few notes on the two minerals of € m he- 
Jasper is a variety of quartz and is always amorphous, i. e., never 
