Pratt : Copra Spoilage.] 



[Phil. Joubn. Sci., VIII, A, No. 6. 



Fig. 1. Bronze propeller shaft, showing corrosive action of acid from decaying copra. 



Fig. 2. Side view of cross section of the shaft shown in fig. 1. 



(The ends were protected by the bearing and propeller, respectively.) 



PLATE I. 



