An illustrated lecture on this subject may be secured at any time by making application to the undersigned. Bulletins and circular letters will be sent to the boys and girls who enroll in this club work from time to time. Personal visits will also be made as often as possible if desired.—Ernest K. Thomas.
[This is a kind of work every state needs.—A. H. W.]
V. MAKING A BIRD CENSUS
There are various ways of making or taking a bird-census, but all depend for their success upon certain rules.
1. Define clearly the area in which the observations are taken.
2. Study carefully the occurrence of species in adjoining localities.
3. Note the differences of occurrence between the foregoing and the area under observation.
4. Study reliable data of other observers, in order to avoid “wild guesses” and to eliminate errors in your own observations.
5. Keep records in a usable form, so that data may be easily compared from year to year.