The first and second forms of description are often used alone. The third and fourth are usually combined. The first or third are sometimes used to supplement the third or fourth or a combination of the third and fourth.

It is sometimes difficult to decide what form of description to use. The contract is to create binding obligations and rights. The seller must use a description under which he can convey good title and the purchaser wants a description that will give him the realty he intends to buy.

Use of terms "more or less." - The seller should use care to undertake to convey only what he owns. As a general rule he should use the same description as was used when he bought. If he has reason to believe that he has not as much depth or width of land as his deed calls for, he may then use the words "more or less." "More or less" is a question of reasonableness. Sometimes a variance of a few inches is unreasonable, as in the width of a city lot, while a foot might not be unreasonable in the depth of the same lot. If the variance is reasonable the seller can give good title under a description using the words "more or less." The purchaser in case of the use of "more or less" will often have the contract provide minimum dimensions or area, less than which he will not take. If a house is standing on the lot a small variance makes little difference for the building will remain and produce rent, whether it is slightly wider or narrower than the lot.