6

The Java modification of my original system of lymph cultivation
having been favourably reported on by the Director, Central Research Insti-
tute, after a visit to the far east it was taken up experimentally towards the
close of 1921-22. The experimental results being uniformly satisfactory the
modification was adopted as standard during 1922-23. The modification con-
sists in the introduction of the rabbit in my cow calf-buffalo calf cycle and so
far has doubled the yield of a buffalo calf. Maximum potency on the cycle
of alternation has not yet been attained, the indications being that the end
point will be reached with a yield slightly under thrice that of the original
cycle.

During the year under review classes for training Superintendents and
Vaccinators in the technique of vaccination and elementary hygiene were
resumed at the Punjab Vaccine Institute at Lahore from January to March.
Four classes, each lasting a fortnight were held and were attended by 4
Superintendents and 19 Vaccinators from the following districts :—

                                                                    I have the honour to be,

                                                                                 SIR,

                                                              Your most obedient servant,

                                                                    W. H. C. FORSTER,

                                                                                LT.-COL., I. M. S.,

                                                              Director of Public Health, Punjab.