PREFACE TO SECOND EDITION- 



The issue of a second edition has given me an opportunity to 

 make a few slight additions to the original note. The most 

 important of those is the paragraph calling renewed attention to 

 the necessity for using a comparatively large amount of spirit. 

 Unfortunately many of the consignments of rats which have 

 been sent to the Museum up to date have arrived in bad con- 

 dition with the hair coming off, as the result of neglecting to 

 carry out the precautions called for. 



Wm. C HOSSACK, M.D., 

 Plague Department. 

 Calcutta : 



November 2nd, 1907, 



