4. The title and decoration of Grand Officer of Forestry Merit and the diploma of highly distinguished merit may be awarded to any person who has rendered outstanding services to forestry by his work in industry, in a public occupation or on scientific or official missions, by forestry research work, by works or publications on forestry or by the establishment of scholarships or endowments to promote the teaching of forestry, the rational apportionment of forests, forest conservation or reforestation.