Joseph:
I too recently was looking for information on Caul. The article, according to Rosane Rocher, is written by Caul, with a commentary by JOnes:I found just one reference: "Though he [Jones] obtained from Govardhana Caul, the Kashmiri Brahman newly appointed pandit to the Supreme Court, the brief account "On the Literature of the Hindus," which he presented to the Society on the 4 May 1787, in the longer commentary he [Jones] appended..." (Rocher, ("Weaving Knowledge: Sir William Jones and the Indian Pandits" 1995: 59)
The commentary (Jones's section) begins "The first chapter of a rare Sanscrit Book, entitled VidyAdersa, or a View of Learnings is written in so close and concise a style, that some parts of it are very obscure..."
I presume, then that the title of the book being cited is "Vidyadersa" (perhaps, "Vidya-darsha" but with Jones's odd orthography, which at the time was often based on Bengali pronunciation). He also then quotes the beginning of the text:
(p. 104 of Volume 2, Asiatick Researches, London, 1792 edition)
I have no idea what text this might be, but perhaps others will recognize it.
Some help, I hope...
Herman