qualities of the lymph to expect it to retain its activity when finally it reached the hands of the vaccinators. During three months of the winter season lymph could be safely transmitted, without encountering extremes of temperature, and would retain its potency long enough to give good results with Sind vaccinators. This short period, however, was not sufficient to allow vaccinators time to vaccinate the children
Fig. 6.
Packing and Despatching the Lymph.
in the areas for which they were responsible, and the objectionable and expensive practice of calf-to-arm vaccination would have to be resorted to during the remainder of the year, if some method could not be devised for counteracting the evil effects of the high temperatures on the potency of the supply of lymph from Belgaum. Thermos flasks were tried, but found too expensive in postage and difficult to pack to prevent
