Which of these does NOT cause the dissolution of a partnership by change of members?

In the context of partnerships, the dissolution of a partnership can occur due to changes in membership. The admission of a new partner, the retirement of an existing partner, or the death of a partner all fundamentally alter the structure of the partnership and, therefore, can result in dissolution.

When a new partner is admitted, it creates a change in the agreement under which the partnership operates. Similarly, when a partner retires or dies, the partnership's composition changes, leading to the dissolution of the original partnership.

However, a loss on operations does not affect the membership of the partnership. Instead, it pertains to the financial performance of the business without impacting the agreements between the partners. Thus, it does not trigger the same structural changes as the other three options, making it the correct choice for what does NOT cause the dissolution of a partnership by change of members.