IN Proc. Roy. Soc., vol. 95, 1923, Mr. H. M. Fox directed attention to a number of cases of “Lunar Periodicity in Reproduction” in marine organisms. To these may be added the hydroid Obelia geniculata ...
TO open this book is to be at once reminded of Hincks' “Hydroid Zoophytes”, now seventy years old, or of Dr. George Johnston's book of a generation before, both of them beloved by innumer able ...
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