OTTAWA 80LDIERS. WARDENANOW ANNOUNCES. WILL BE HELD ON DUTY UNTIL ALL OF MEN HAVE BEEN RETURNED TO THEIR WORK.Joliet. June IS— Dynamite was dta covered late yesterday In a cell at the penitentiary. A search which was made when the convicts were taken from their cells and guarded by sold-iers, also revealed quantities of clothing. knives and (lies and other cun traband.Officials of the prison believe that this provq« the theory that communication with persons outside the walls has existed and that Inmates received weapons which they had hiddenaway, from friends outside. Altho theclothing may have been stolen from the prison, the presumption Is that It was smuggled to convicts from outside the walls.Practically all convicts In the prison have been searched and knives or any other weapons found in their possession confiscated A number of the inmates were returned to work clearing wreckage caused during the riot Tuesday morningConvicts Change Attitude.When the convicts were taken I from their cells while the cells were being searched, they are said to have assumed a different attitude than that which prevailed since the outbreak