the intestate was a satisfactory employee and was about on a par in ability and mental competence with others similarly employed by him.
Over against this testimony, the plaintiff cited the fact that the father, whose opportunity for observing the mental capabilities of the intestate was superior to anyone else, had felt the intestate was perfectly competent to take care of his *653 affairs, otherwise, he would have trusteed the devise to the intestate. Moreover, the intestate had been found mentally competent both for induction and for service, until honorably discharged, for two years in the Army. Mr. Langford, with whom the intestate negotiated the Gulf option, found the intestate perfectly competent mentally to take care of his interests in the negotiations of the option; in fact, he emphasizedthat the intestate "drove a hard bargain." The representatives of both Sinclair and the plaintiff were of the opinion the intestate was mentally competent to handle his affairs and able to understand thoroughly the negotiations had with him. More significantly, when the intestate talked to Mr. Riggs, he discussed in detail the terms of the lease options, evidencing that he clearly understood the nature, terms and effect of the instruments. Mr. Riggs, who had known the intestate for many years, also testified that he thought the intestate mentally competent. Mr. Harvin, who necessarily had considerable opportunities to observe the intestate, was of the opinion that the intestate comprehended the details of the lease options and evidenced the competency to protect his interests.
The rule as to mental competency under