The population increase in the Netherlands in the years after the first World War caused the author to study its consequences, particularly in relation to Dutch agriculture. The concepts 'overpopulation and underpopulation and optimum population' were discussed in the light of the theories of Malthus and many others. As definition the standard of living, measured by average income per head, was chosen.The population density and the possibilities of changing the agricultural production were also judged from an economic aspect. Employment in agriculture could be diminished by planning and mechanization; intensification and reclamation could increase employment. In the 1920's the prices of land and the rent of farms increased sharply anddid not respond to the decline in prices of agricultural products. This led to a partial overpopulation that may be ascribed to the large number of farmer's sons, born during prosperity, who had been waiting for a farm. Besides the possibilities of extending agricultural employment, emigration of farmers and farmer's sons was considered one of the best remedies for this problem. Improvement of the facilities (without direct subsidies of the Government) for settlement in France were discussed.

The population increase in the Netherlands in the years after the first World War caused the author to study its consequences, particularly in relation to Dutch agriculture. The concepts 'overpopulation and underpopulation and optimum population' were discussed in the light of the theories of Malthus and many others. As definition the standard of living, measured by average income per head, was chosen.The population density and the possibilities of changing the agricultural production were also judged from an economic aspect. Employment in agriculture could be diminished by planning and mechanization; intensification and reclamation could increase employment. In the 1920's the prices of land and the rent of farms increased sharply anddid not respond to the decline in prices of agricultural products. This led to a partial overpopulation that may be ascribed to the large number of farmer's sons, born during prosperity, who had been waiting for a farm. Besides the possibilities of extending agricultural employment, emigration of farmers and farmer's sons was considered one of the best remedies for this problem. Improvement of the facilities (without direct subsidies of the Government) for settlement in France were discussed.

O Agricultor foi lançado na década de 1920 e publicado até 1943, pela então Escola de Agrícola de Lavras. Periódico escaneado (v. 9, n. 10, dez. 1930): alguns caracteres podem ter sido reconhecidos erroneamente.

O Agricultor foi lançado na década de 1920 e publicado até 1943, pela então Escola de Agrícola de Lavras. Periódico escaneado (v. 9, n. 12, set. 1929): alguns caracteres podem ter sido reconhecidos erroneamente.

The object of this paper has been to call attention to the main lines of work that are under consideration or await further study, rather than to present results. Peat investigations require organization, a central station, and prolonged research. It is greatly to be hoped that the national sections will each maintain an information service or clearing house for projects, staff members, publications of their scientific institutions, and for the methods and results of agricultural work on peat lands of different types. The study of regional areas of "Low Moor" (Niedermoor) has been proposed from the point of view of stratigraphy, profile analyses, and cultural operations on a comparative basis, with the view to adopting a uniform procedure in peat investigations. In this connection, Dr. Hissink suggests consideration of a nomenclature in three languages, German, French, and English. By adopting more uniform methods, terms, and criteria, the investigations, under way and proposed, will not only increase our knowledge concerning deposits of peat and the conditions affecting them, but will also hasten the solution of those peat problems that have application and value for all countries.

The object of this paper has been to call attention to the main lines of work that are under consideration or await further study, rather than to present results. Peat investigations require organization, a central station, and prolonged research. It is greatly to be hoped that the national sections will each maintain an information service or clearing house for projects, staff members, publications of their scientific institutions, and for the methods and results of agricultural work on peat lands of different types. The study of regional areas of "Low Moor" (Niedermoor) has been proposed from the point of view of stratigraphy, profile analyses, and cultural operations on a comparative basis, with the view to adopting a uniform procedure in peat investigations. In this connection, Dr. Hissink suggests consideration of a nomenclature in three languages, German, French, and English. By adopting more uniform methods, terms, and criteria, the investigations, under way and proposed, will not only increase our knowledge concerning deposits of peat and the conditions affecting them, but will also hasten the solution of those peat problems that have application and value for all countries.

Un aspecto poco explorado de la Entomología aplicada a la Agricultura, es el de la lucha biológica contra las malas hierbas. La vegetación espontánea que invade los cultivos, ocasiona, como es bien notorio, cuantiosas pérdidas, no sólo por las materias fertilizantes que dichas hierbas roban a las plantas cultivadas, sino también por la enorme cantidad de agua que transpiran, perjuicio mucho más grave en las comarcas secas. En las zonas de regadío, como las huertas valencianas, la abundancia de agua y abonos favorece extraordinariamente la multiplicación de algunas plantas espontáneas, lo que obliga, en ciertos casos, a cambiar aquellos cultivos que no permiten hacer las labores necesarias para limpiar el terreno de broza, por otros cultivos menos remuneradores, pero que permiten librar el suelo de hierbas. No es necesario encarecer, por tanto, la importancia del asunto. La lucha contra las malas hierbas por procedimientos artificiales es difícil y costosa. Por ello, se ha pensado en utilizar para destruirlas sus enemigos naturales y, en particular, los insectos y otros artrópodos que viven a sus expensas.