320 



DISCOVERY REPORTS 



I 50YDS O WIND 



Text-fig. 8. Physalia physalis. Angle of drift in experiment number 7. 



5-iMILES 



/ S D B 



Text-fig. 9. Physalia physalis. Comparison between courses-made-good by a deep-keeled fast sailing yacht, Y, a 



shallow draft sailing boat, SDB and Physalia, P. 



