W. R. Macdonell 
383 
It is obvious that in dealing with the last four tables we have descended to a 
much lower plane of correlation, and the results may possibly somewhat modify 
medical opinion as to the degree of significance of foveation, number of scars and 
scar area. 
I understand that the figures relating to the recent smallpox epidemic in 
Glasgow will soon be available, and no doubt more statistics of the present London 
epidemic will be issued shortly ; their publication will furnish a mass of extremely 
interesting and valuable material for statistical work. It is to be hoped that 
information will soon be given regarding the social rank and occupation of the 
patients, as an investigation of the type and mortality of the disease in the 
different classes of the community seems to me a very important line of statistical 
inquiry, having regard to the state of the controversy at the present time. 
Our numbers demonstrate that high correlation exists between the presence of 
the vaccination scar and both the recovery from and the mildness of the attack. 
To complete a logical demonstration, however, of the effectiveness of prior 
vaccination in cases of smallpox we at least require to determine the correlation 
between the physique and nourishment of the attacked — to some extent indicated 
by their social class — and the presence or absence of the scar. 
