The lines on figure 5 indicate the average dates of the first killing frost in the fall, and these dates, given at the ends of the heavy lines, are of direct value to the beekeeper as giving the proper time for putting on the winter cases. The average dates of the last killing frost in the spring do not show exactly the same lines on the maps, but the differences are not sufficiently great to justify the use of a separate map for this purpose. The authors have chosen therefore to divide the country into the zones indicated, and the recommendations given below apply to each of the zones shown. On account of the variations in elevation, it is impossible to carry these lines into the Rocky Mountain region, but as packing is just as necessary in the West as in the East, figure 6 is inserted to indicate roughly the time for the putting on of the packing in the fall. The dates in this map are the average dates of the first killing frost. By consulting Table I the beekeeper of the West may learn the time advised for the removal of the packing, by placing his locality in its proper zone, on the basis of the first killing frost. Table I.--_Dates for the packing and unpacking of been in the various parts of the United States, board on data furnished by the Weather Bureau for the average dates of the first and last killing frosts. The amount of packing recommended for each zone is included._ ------+-------------+-----------+----------------+----------------- | Date for | Date for | Packing | Zone.| packing. | unpacking.| recommended.[1]| Remarks. ------+-------------+-----------+----------------+----------------- A | ..... | ..... | ..... | None needed. B | ..... | ..... | ..... | Do. C | November 25 | March 15 | 2-4- 6 | D | November 10 | April 10 | 4-6- 8 | E | October 25 | May 1 | 4-6- 8 | F | October 1 | May 20 | 4-8-12 | G | September 15| June 1 | 4-8-12 | Cellar wintering | | | | much safer. ------+-------------+-----------+----------------+----------------- [1] In this column the first figure represents in inches the amount of packing needed below the bottom boards, the second the amount of side packing, and the last the amount needed on top. TIME FOR PUTTING ON THE WINTER PACKING.