From the heavens to the certer of the earth. Bl. Law Dict.(2d Ed.)1 dendnm. From common observance there should be no departure; there must be no departure from common usage. 2 Coke, 74; Co. Litt. 186a, 2296, 365a; Wing. Max. 752, max. 203. A maxim applied to the practice of the courts, to the ancient and established forms of pleading and conveyancing, and to professional usage generally. Id. 752 755. Lord Coke applies it to common professional opinion. Co. Litt. 186a, 3646.