While at the start of the war the comparatively few airplanes in use were employed as scouts, a few months saw them fitted with machine guns and devices for dropping explosives. Hand in hand with this came the rapid development of the airplane itself. To-day we can truthfully say that a journey, even a long one, by airplane is less dangerous than an automobile ride through a densely populated district. But one thing we must not forget, even though the invention of the airplane by the Wrights is an American one (in spite of the fact that the Wrights give some credit to the German Lilienthal) the Europeans have far outstripped us in the development of this invention. As sad as it is to say it, we must admit that in regard to aviation America is still in its infancy. Every European nation has outdone us. When, in the summer of 1916, we sent our troops to Mexico, they had only six old machines at their disposal. Instead of relying on these for information, General Pershing had nothing but anxiety for their safety every time they made a flight. But here, too, if all signs are not deceiving, war has helped us to awake. Aside from the activity in our training-schools where thousands of our young men, surpassed by none anywhere, are being trained, the building of our airplanes is taking a great step forward. The experience gained on the other side is helping us here. At first it was the automobile factory that furnished the satisfactory motor. But now through the war the airplane factories have made enormous progress and helped the aviator to attain new marks in speed, reliability and endurance. While this war lasts every improvement in the airplane is utilized to make added destruction. Yet we can not doubt that after the war we will see further progress made in the airplane in the peaceful contests which are to follow. INTRODUCTION BY PROF. HERMANN BÖLCKE, DESSAU Oswald Bölcke was born on the 19th of May, 1891, in Giebichenstein, a suburb of Halle on the Saale. Here his father was professor in the high school. His sister, Luise, and his two brothers, Wilhelm and Heinrich, were born before him in Buenos Ayres, Argentina. There his father had had his first position--rector of the German Lutheran School. Later, Oswald's brother Martin was born in Halle and his brother Max in Dessau. Oswald was the first child born to the Bölcke's in Germany. On the 17th of July, the wedding-day anniversary of his parents, he was baptized by his uncle, the Rev. Edmund Hartung. This occurred during a vacation spent at his grandmother's, at Freyburg-on-the-Unstrut, in the same church in which his mother had been baptized, confirmed and married, by the same minister. After a year the family moved to Halle, where he could romp joyously on the Viktoria-platz with his two older brothers and his sister.