Chapter 6

The aquarium, p. 113--The arrangement of the tanks and exhibits, p. 114--The submarine effect of this arrangement, p. 115--Appearance of the submarine dwellers in their natural surroundings, p. 116--The eels and cuttle-fishes, p. 116--The octopuses, p. 117--The technical department of the laboratory, p. 119--The work of Dr. Anton Dohrn, founder of the laboratory, p. 121--The associates of Dr. Dohrn, p. 122--The collecting of surface specimens, p. 123--Collecting specimens by dredging, p. 124--Fauna of the Bay of Naples, p. 124--Abundance of the material for biological study, p. 125--Advantages offered by marine specimens for biological study, p. 126--Method of preserving jelly-fish and similar fragile creatures, p. 127--Uses made of the specimens in scientific study, p. 128--Different nationalities represented among the workers at the laboratory, p. 130--Methods of investigation, p. 131--Dr. Diesch's studies of heredity at the laboratory, p. 131--Other subjects under scientific investigation, p. 132--The study of chromosomes, p. 133--Professor Weismann's theory of heredity based on these studies, p. 33--Experiments in the division of egg-cells, p. 134--Experiments tending to refute Weismann's theory, p. 136--Dr. Dohrn*s theory of the type of the invertebrate ancestor, p. 137--Publications of the laboratory, p. 139--Meetings of the investigators at Signor Bifulco's, p. 141--Marine laboratories of other countries, p. 142.