Subject to a contract between the partners the firm shall indemnify a partner in respect to payments...........

Subject to a contract between the partners, the firm shall indemnify a partner in respect to payments made and liabilities incurred by him:

in the ordinary and proper conduct of the business

in doing such act, in an emergency, for the purpose of protecting the firm from loss, as would be done by a person of ordinary prudence, in his own case, under similar circumstances