Owing to exceptional local conditions since the fall of 1937,theroutine excavation at Choukoutien could not be resumed,nor was itpossible to carry out field work in other regions of North China.Our scientific activities,however,progressed as heretofore and con-siderable time was devoted to the preparation and study of the material Owing to exceptional local conditions since the fall of 1937, theroutine excavation at Choukoutien could not be resumed, nor was it able to carry out field work in other regions of North China. Our scientific activities, however, progressed as heretofore and con-siderable time was devoted to the preparation and study of the material