nd the structure of the atom, p. 108--Effect of
radio-activity upon heat-giving life of the sun and the earth, p. 111.

CHAPTER V--THE MARINE BIOLOGICAL LABORATORY

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.

CHAPTER VI--ERNST HAECKEL AND THE NEW ZOOLOGY

The "dream city" of Jena, p. 145--The old market-place, p. 147--The
old lecture-halls of the university, p. 148--Ernst Haeckel, p. 151--His
discoveries of numerous species of radiolarians, p. 153--The part played
in evolution by radiolarians, p. 156--Haeckel's work on morphology,
and its aid to Darwinian philosophy, p. 156--Freedom of thought and
expression in the University of Jena, p. 157--Haeckel's laboratory, p.
160--His method of working, p. 161--His methods of teaching, p. 164--The
import of the study of zoology, p. 166--Its bearing upon evolution, p.
168--The present status of Haeckel's genealogical tree regarding the
ancestry of man, p. 171--Dubois's discovery of the skull of the ape-man
of Java, p. 173--Its close re