Interrelations between Clutch-Size, Brood-Size, Prefledging Survival, and Weight in Kent Island Tree Swallows

Kent Island Tree Swallows Bird-13anding April roles, but the population has not been studied long enough to provide sufficient data on the population changes.In the summer of 1947 about 50 new boxes were erected, and the old ones removed, in preparation for the investigation in 1948 which will be considered in detail.I wish to express my appreciation to Prof. G. E. Hutchinson and to Dr. E. S. Deevey, Jr. with whom I have frequently discussed problems that have arisen in the preparation of this paper, and who have greatly aided in their clarification.I am also indebted to Prof. L. B. Chapman for supplying me with unpu, blished data on tree swallows nesting at Princeton, Massachusetts.