The Outermost House, Henry Beston, introduction by Robert Finch, xxiv + 222 pp. Penguin Books, New York, soft cover $6.95. This book is part of the Penguin Nature Library. In 1925, Henry Beston bought a small acreage on Cape Cod and built a two room home there, in which he lived for a year. The book is a record of that period: his observations on the sea, the land and its creatures and features, and anything else that attracted his attention. His observations are interesting to read just for themselves, but some items invite comparison of those times with the present. An irreducible residue of crude oil, called by refiners \u27slop,\u27 remains in stills after oil distillation, and this is pumped into southbound tankers and emptied far off...