Summary. 
lens and by means of the compound microscope. 
The presentation of the results of his researches 
together with appropriate engravings to the 
Royal Society of London, England, of which so¬ 
ciety he^was afterward Fellow. 
Power to produce the so-called infectious dis¬ 
eases ascribed to micro-organisms by a scientist 
of Vienna. Theories advanced by this scientist. 
Non-acceptance of his theories: 
The germ theory of disease again advanced 
about sixty years later and its successful demon¬ 
stration. 
A short account of one of the subjects which 
caused much discussion during the century and a 
half between the discoveries of the Hollander and 
the acceptance of the theory of the scientist of 
Vienna. 
The man who first threw light upon the mys¬ 
tery surrounding this vexed question and the 
manner in which he carried on his experiments. 
Work and its results along the same lines by 
other scientific men of that period. 
Errors o£ some of the early students of bac¬ 
teriology. 
Slow progress in discovering a special germ for 
each infectious disease. 
Men who are considered to have made the most 
valuable contributions to bacteriology and their 
discoveries. 
17 
