After Réaumur many others experimented with artificial hatching. Some of the ideas were obviously more impractical than those of Réaumur, but the experimenters tried them out and sometimes succeeded in hatching chickens by very peculiar and laborious processes. One man in England, in the latter part of the eighteenth century, hatched some chickens from eggs placed in cotton batting in a sieve adjusted over a charcoal fire in a small fireplace. The fire was watched constantly for three weeks, either by himself or by some member of his family. He demonstrated that eggs could be hatched in this way, but not that it could be done profitably. Practical incubators were not produced until about forty years ago. Although incubators and brooders have been brought to a relatively high state of efficiency, they are far from perfect. Inventors of the best machines are still studying ways to improve them. In this and many other fields there are opportunities for inventive genius. =Education and investigation.= Lectures on poultry have been given occasionally at agricultural institutes in the United States since about 1860. After 1890 the demand for such lectures, and the number given, constantly increased, and ability to speak in public became valuable to one versed in aviculture. Then the study of poultry culture was introduced into agricultural colleges, and a new field was opened to poultry keepers with a faculty for teaching, and for trained teachers with special knowledge of domestic birds. The teaching of poultry culture impressed upon those engaged in it the need of scientific investigation of many problems not clearly understood even by the best-informed poultrymen. The agricultural experiment stations had been giving little attention to some of these problems except in a desultory way and without important results. As the demands for more accurate information on many topics increased, many of the experiment stations began to make important poultry investigations. For this work men specially trained in various sciences were required. As a rule the men that were secured for such work knew very little about poultry when they began their investigations, but it was much easier for them to acquire a knowledge of poultry sufficient for their needs than for persons who had poultry knowledge and no scientific training to qualify for positions as investigators. The field of investigation of matters relating to poultry is constantly being extended. Proficiency in physics, chemistry, biology, surgery, and medicine, and in higher mathematics as far as it relates to the problems of any of the sciences mentioned, will always be in demand for scientific work in aviculture. In the future the most efficient teachers and investigators will be those whose early familiarity with domestic birds has given a greater insight into the subject than is usually possessed by those who take up the study of the subject comparatively late in life.