in another short film by educational film and director charles lamont have re united sonny ( junior coughlan ) and mary lou ( shirley temple ) in this early temple vehicle . in this one and little mary lou be watch her big brother sonny do a chemistry experiment . sonny pal show up and they make plan to look for gold in the desert and to raise money for sonny and so he can attend the military school his friend will be attend in the fall . mary lou hide in the trunk of sonny car and much to the consternation of sonny when he find her . while he and his pal look for gold and mary lou befriend a man she call gus and who seem lose and can not recall his identity . when the boy tell him theyre search for gold and gu show them bag of gold dust . back at home and the boy show their find to a local assayer while gus fiddle with sonny chemistry set . the result explosion help gus regain his memory and he reward sonny . director lamont be well know for other film and include abbott and costello feature and ma and pa kettle film and hit the ice and where she dance .