Proceedings of the American Academy of Arts and Sciences. 



Vol. 52. No. 5. — October, 1916. 



CONTRIBUTIONS FROiM THE ZOOLOGICAL LABORATORY 



OF THE MUSEUM OF COMPARATIVE ZOOLOGY 



AT HARVARD COLLEGE.— No. 280. 



THE 'REFRACTIVE BODY' AND THE 'MITOCHONDRIA' 

 OF ASCARIS CAN IS WERNER. 



By a. C. Walton. 



With Two Plates. 



