Smallpox and cowpox are closely allied and the substances formed in the blood by the one are resistant to the virus of the other.

I do not see how any reasonable person can oppose vaccination or decry its benefits.

I show you the mortality figures( 9) of the Prussian Army and of the German Empire.

A comparison with the statistics of the armies of other European countries in which revaccination is not so thoroughly carried out is most convincing of its efficacy.
(8) Edward Jenner: The Origin of the Vaccine Inoculation, London, 1801.
(*) Reprinted by Camac: Epoch-making Contributions to Medicine, etc., 1909 .-- Ed.
(9) Jockmann: Pocken und Vaccinationlehre, 1913.
The early years of the century saw the rise of modern clinical medicine in Paris.

In the art of observation men had come to a standstill.
I doubt very much whether Corvisart in 1800 was any more skilful in recognizing a case of pneumonia than was Aretaeus in the second century A.D.But disease had come to be more systematically studied; special clinics were organized, and teaching became much more thorough.