820 Instruction in Geological Investigation, 
The numerous intersecting and faulted dikes on our sea-ct 
north of Boston present unexcelled examples for work of t 
kind: the amygdaloid in Brighton and its banded amygduls 
offer an instructive problem: but the phenomena of the drift ar, 
as a rule, too complicated for local elementary treatment by the 
methods described above. Their observation needs to be sup 
The winter season, when out-door work is stopped, a 
well employed in securing some familiarity with our geologi 
literature. Government and State reports with Primes ! 
thereto, the American Fournal of Science, and the R | 
ciety’s catalogue of scientific papers, with the more! 
journals that it leads to, are our chief materials, but p 
will not speak further. : 
At the end of the second course with its field-work, the * 
must consider carefully if he wish to go farther into geology’ 7 
he decide to go on, there are courses in lithology, &®* 
geology, and palzontology before him, but these io 
