semblance to the skull of the ape, p.
173--Man's line of descent clearly traced by Haeckel, p. 175--The
"missing link" no longer missing, p. 176.

CHAPTER VII--SOME MEDICAL LABORATORIES AND MEDICAL PROBLEMS

The Boulevard Pasteur, p. 179--The Pasteur Institute, p. 180--The tomb
of Pasteur within the walls, p. 181--Aims and objects of the Pasteur
Institute, p. 182--Antirabic treatment given, p. 183--Methods of
teaching in the institute, p. 185--The director of the institute and his
associates, p. 185--The Virchow Institute of Pathology, p. 186--Studies
of the causes of diseases, p. 187--Organic action and studies of
cellular activities, p. 188--The discoveries of Rudolph Virchow, p.
188--His work in pathology, p. 189--Character of the man, his ways of
living and working, p. 189--His methods of lecturing and teaching, p.
191--The Berlin Institute of Hygiene, p. 193--Work of Professor Koch
as carried on in the institute, p. 194--Work of his successors in the
institute, p. 195--Investigations in hygiene, p. 196--Investigations
of the functions of the human body in their relations to everyday
environment, p. 197--The Museum of Hygiene, p. 198--Studies in methods
of constructing sewerage systems in large cities, p. 199--Studies in
problems of ventilation, p. 200.

CHAPTER VIII--SOME UNSOLVED SCIENTIFIC PROBLEMS

The ever-shifting ground of scientific progress, p. 203--Solar and
telluric problems, p. 205--Mayer's explanation of the continued heat
of the sun, p. 206--Helmholtz's suggestion as to the explanation, p.
207--The estimate of the heat-giving life of the sun by Lord Kelvin
and Professor Tait, p. 208--Lockyer's suggestion that the chemical
combination of elements might account for the sun's heat, p.
209--Computations as to the age of the earth's crust, p. 210--Lord
Kelvin's computation of the rigidity of the telluric structure, p.
211--Estimates of the future life of the earth, p. 212--Physical
problems, p. 213--Attempts to explain the power of gravitation,
p. 214--The theory of Le Sage, p. 214--Speculations based upon the
hypothesis of the vortex atom, p. 216--Lord Kelvin's estimate of the
vortex theory, p. 217--Attempted explanation of the affinity of
atoms, p. 217--Solubility, as explained by Ostwald and Mendeleef, p.
218--Professor Van 't Hoof's studies of the space relations of atoms, p.
219--Life problems, p. 220--Question as to living form