HEALTH PRECAUTIONS 369 
they reach reservoirs, are used for washing 
clothes or bathing and become infected in this 
manner. It is obviously out of the question to 
boil all water prior to drinking and if you are 
obliged to take many trips to the interior or off 
the beaten paths of travel, bottled mineral 
waters are not always obtainable. Therefore 
it is wise for the purposes of such excursions to 
carry any of the well-known makes of pocket 
filter, which come especially made for such 
purposes. Let me take advantage of this op 
portunity to correct the erroneous idea enter 
tained by so many of the laity that locally made 
aerated mineral waters are free from bacteria. 
They should be shunned as much as the local 
unboiled water. The best thing to do if you 
are going to these countries, is to have your 
system rendered immune to the typhoid 
bacillus, by having your family physician give 
you the anti-typhoid vaccination, such as is 
used in the American army and navy. There 
is but little inconvenience attending its admin 
istration and you can rest assured that after 
taking the treatment you will not contract