-10 
It is necessary also to consider the possible disturbance of poxv 
tioiB of tbe formation by the hand of man, ^Tudgr^ont has been 
vitiated also by the fact that as a rale the collectors were on*, 
thuctasts who confidently espewied confiraation of their precon¬ 
ceived views and hence required no verification hut the finding 
of the specimen in more or loss intimate association with the 
parti cular formation* 
It is especially noted that the 2nd and 3rd questions can 
be safely answered only by a geologist whoso acquirements are of 
a high order. Ho should know the problems of the for at ion as 
well as the pitfalls of the evidence* He should know the ago 
of the stratum or deposit with which the specimen in associated* 
vh?„ (4/fv -#-4 4" t. t‘-i v r;%a., 
he should know the dangers of disturbance and recent intrusion and 
should by examination of conditions determine that the 
VvA-y 4 
formation Ms never boo disturbed at the particular spot. So 
groat is the danger that he should personally examine the parti¬ 
cular association, should see the iiipression of the object removed, 
nil .self ror.evad it. ho should be oiohout bias 
*F 
