The ""GO"" (gradual occlusion) of the anterior descending ramus of the left coronary artery was effected at the origin of this artery, utilizing the growth of a localized dicetyl-phosphate granuloma in 27 dogs, and pertinent features of such ""GO"" dogs were analysed in comparison with the characteristics of 9 normal dogs and 6 dogs with acute myocardial infarction produced by the ligation of the anterior descending ramus.
