The paper label is
not sufficiently durable or permanent; it may be destroyed or lost, either deliberately or accidentally. Therefore, as has just been stated, once the label has been removed, it is impossible to identify where the particular can came from, supposing 4 p.m. a case of ptomaine poisoning has occurred-this is of great importance, because some cases of ptomaine poisoning are fatal. If a poisoned can is not marked in such a way that it can be identified, it is impossble to trace the factory in which the goods were put up and where there may be many other cans in the same condition. I trust that some means may be adopted of having a permanent mark on the can itself.