Counsel for the Commissioner did inform counsel for the taxpayer before the case came on for hearing before me of how the figure in question was calculated. Nevertheless he felt obliged on his instructions to support a proposition that the figure was not challengeable. The assessment, he said, was a "default assessment" made pursuant to s. 167 (c). He relied upon the requirement of s. 185 that the objection must state the grounds relied upon "fully and in detail". He pointed to s. 190, which provides that the taxpayer is limited to the grounds stated in his objection, and that the burden of proving the assessment is excessive is on the taxpayer. While supporting the Commissioner's view that these provisions prevented my examining the manner in which the figure was arrived at, counsel for the Commissioner did, at my request, explain this to me, as he had, in my view quite properly, explained it to counsel for the taxpayer. The process of calculation was as follows. The Commissioner obtained valuations of the freehold of portions 4, 5 and 6, the values being assessed as at 10th September 1962, the date the taxpayer exercised the option. Portion 4 was valued at $180,000: portion 5 at $276,630: portion 6 at $108,000. This makes a total of $564,630, as the value of the whole of the Rockingham land. The fractional value of portion 5 was thus 276,630 564,630 . Applying this fraction to $80,000, the amount the taxpayer paid her brother for his half interest, yields $39,730. This sum was then assumed to be the part of the price attributable to the purchase of a half interest in that part of the land which was later to be separated from the rest as portion 5. The price which the taxpayer got when she sold portion 5 was, after deducting the costs of selling, found to be $307,264. Half of this, namely $153,632, was then assumed to represent the interest which the taxpayer had bought from her brother. Subtracting $39,730, the price it was assumed she had paid for this interest, the result is $113,902. Therefore this is said to be profit made by the taxpayer by buying and selling a half interest in portion 5.