Articles II to XVII. inclusive. of the International Sanitary Convention for Aerial Navigation. 1944. contain amendatory provisions relating speciflcally to articles of the convention of 1933 with a view to making them conform with present emergency conditions. The remaining articles in each of the conventions specify the manner in which the convention shall come into force. the effect of such convention upon the convention which it amends. the duration of the convention. and formal or procedural matters. including the procedure for application of the convention to colonies or to overseas and other territories. Among the significant improvements effected by the conventions of 1944 is the amendment embodied in article XV of the International Sanitary Convention. 1944. which provides that "bills of health and consular visas shall be abolished as soon as the conditions of hostilities permit the establishment of effective epidemiological communications." and substitutes for the bill of health a Declaration of Health. This change has been made because many countries no longer require the bill of health and other countries were about to abolish it at the outbreak of hostilities. The use of bills of health has been rendered obsolete by the improved methods of notification of epidemic diseases and has lent itself to usages which were often in no way connected with the protection of health in the countries concerned.