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These materials were designed to be used by life science students for instruction in the application of physical theory to ecosystem operation. Most modules contain computer programs which are built around a particular application of a physical process. PRNT3D is a subroutine package which generates a variety of printer plot displays. The displays include single and multiple x vs y functions, multi-value x, y relationships, and density plots which simulate three-dimensional effects by means of overprinting. The package features one- and two-dimensional interpolation, "zoom-in" capacities, automatic scaling, logarithmic scaling, flexible tilting, and multi-page plotting. This module assumes that PRNT3D is already incorporated as a subroutine in an existing program which uses the free-form input package and follows the conventions outlined in Design Standards for Computer Programs. A more thorough discussion of PRNT3D is contained in its programer's guide. (Author/CS)

1Boy Crusoe

By Allan Eric

Also published as" A Yankee Crusoe" . A 15 year old hard working and studious farm boy finds the lure of adventure on the seas as a merchant seaman more than he can resist. This is his story. " I was born in a little town in the State of Maine, near the close of the Civil War. My boyhood life did not differ materially from that of the average farmer's son in the remote country districts of New England--except, perhaps, that I read more and thought more. Hard work on the rugged soil, two terms each year in the little yellow country schoolhouse, a day's fishing now and then filled the early years of my life full to over-flowing. " What he gets is enough excitement and adventure to overflow his wildest dreams. How he experiences disaster and uses his wits and knowledge to overcome every problem makes for a great read. - Summary by Phil Chenevert