92 
NATURE STUDY. 
examinations must be made before the status of each spec¬ 
ies as regards dependence can be determined. And it is 
not going to be easy to arrive at positive results even with 
the most searching investigation, for the problems of sap- 
rophytism are complicated by the intrusion of the problems 
of symbiotism. It has already been found that some sap¬ 
rophytes are also symbiots, and that the two conditions are 
more or less interdependent. 
The undoubted symbiots will be considered in the next 
article. 
An Autograph of An Earthquake. 
BY WIEEIAM H. HUSE. 
Earthquakes have come and gone. Some, like most men, 
have made no record of their coming. Others have left 
their footprints on the rocks of time. 
On a rocky hill a few hundred 
feet in altitude, a short distance 
north of Take Massabesic in the 
town of Auburn, where the sum¬ 
mit has been washed bare of all 
vegetation, there can be seen sev¬ 
eral narrow dikes of igneous rock. 
In one place the bending of the 
strata of the surrounding rock adds 
interest to the dikes, which other¬ 
wise have nothing to distinguish them. There is one dike 
a few inches in width, then a portion of the country rock 
a little wider. South of this is a wider dike, the south¬ 
ern side of which is concealed by vegetation. The pecu¬ 
liar bending of the strata of the gneiss at their ends 
tells the story of the condition of the archsean rock 
when the settling and bending occurred. The rock 
was solid enough to crack open but still somewhat 
