In recent weeks the stock market has been cavorting like a grain-fed horse. Last week it grew weary. That is, many stocks which were at their record highs last February and which toppled in March, recovered, then broke slightly. (The March break brought the whole Manhattan Stock Exchange listings down an average of 30 points.) This table shows the extent of some recoveries: SPRING RECENT
Low HIGH
General Motors 113 225¾
U. S. Cast Iron Pipe 150 249
U. S. Steel 117 156⅜
Hudson Motors 50 74½
Du Pont 193 314½
This midsummer rally, now history, came unexpectedly....