When the plaintiff was able to establish the illiteracy of Netai and his physical ailment, the onus to establish that Netai had executed the said deed with full knowledge and understanding is upon the appellant. Curiously, the deed written in vernacular language did not mention that the contents of the deed were read over and explained to Netai before execution, which ordinarily is done by the Deed Writer in order to obtain the consent of the executor with regard to the contents of the document. In other words, the mind of the executor should carry with the document which he is supposed to execute. On the teeth of such evidence, it was incumbent upon the appellant to produce the Deed Writer or other convincing evidences. It is submitted that the Deed Writer possibly was unavailable by the time trial commenced. However, we could not find any reflection of such submission in the record of the case. There was no evidence to show that the Deed Writer was unavailable and hence could not be produced. There was no evidence of any attending witnesses who could have proved due execution and mental alertness of the donor at the time of execution of the said deed.