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A.GENERAL REMARKSDuring three years 4500 reports of whales sighted from Netherlands ships were collected, bearing on approximately 11.000 individual animals. Most of the observations were made in the Atlantic and Indian Ocean. It was supposed that the species could be determined with a fairly high degree of reliability in the case of Humpback Whales, Sperm Whales and Right Whales. No distinction could be made between Blue, Fin, Sei and Bryde Whales. They were collected under the heading Rorquals. Catches of land stations and strandings of whales, however, indicate that in all areas, at least a part of these Rorquals must have been Blue or Fin Whales. Probably the majority of this part were Fin Whales.Nevertheless it must he emphasized that the observations give no exact figures but only indications. It would be highly desirable if the results could be controlled by observations made by experienced whale biologists or gunners, especially in tropical and subtropical waters. We have the impression that for the time being no better results can be obtained with the present type of research. On the other hand, the fact that the generally known facts about the annual migration of the big whales were also clearly shown by this research, may be an indication for a certain degree of reliability of the research. The monthly number of animals o

Remarks on the Distribution and Migration of Whales, based on Observations from Netherlands Ships