THE BROOD-REARING CYCLE OF THE HONEYBEE 13 
the following method: Before packing, three frames in the lower hive 
body are replaced by two chaff division boards the lugs of which 
have been sawed off. After removing the frames in the second hive 
body these division boards in the lower hive body can be pulled out 
easily, and the space created by their removal is then sufficient to 
allow removal of the frames which were there with them. The space 
occupied by two packed division boards of the type commonly 
manufactured is equivalent to that occupied by three Langstroth 
frames. 
SEASONAL CHARACTERISTICS OF 1921 
In the season of 1921 the weather conditions at the location of the 
bureau apiary were not favorable for a maximum honev crop. 
Although warm weather in late February and the fore part of March 
had brought out fruit bloom and other flowers somewhat prematurely, 
and although the thermometer registered as high as 90° F. (32.22° C.) 
on March 27 and 28, on March 29 and 30 most of this early bloom 
was destroyed by frost. On the morning of April 1, moreover, 
traces of snow were visible on the covers of the hives. During the 
fortnight beginning March 29, with one exception, when 59° F. 
(15° C.) was the minimum registered, the temperature dropped each 
night well below the clustering point (57° F., 13.89° C.) even reach- 
ing the freezing point on six occasions. One 96-hour period had a 
maximum of only 62° F. (16.67° C.) and a minimum of 29° F. (-1.67° 
C). On four occasions 57° F. (13.89° C.) was the highest tempera- 
ture recorded during a 24-hour period. Slight precipitation occurred 
on eight days of this fortnight. Such weather curtailed pollen and 
nectar gathering, which had just before been going on very actively. 
Warmer weather set in again with the middle of April, and con- 
tinued until the end of the summer, although there were a few days 
of cold, rainy weather in early May. The temperature during April 
ranged from 29° F. (-1.67° C.) to 96° F. (35.56° C.) ; in May, from 
39° F. (3.89° C.) to 93° F. (33.89° C). Rain on six consecutive 
days, beginning with May 11, spoiled the chances for a large yield 
from black locust (Robinia pseudacacia) . On May 18 the tulip tree 
(Liriodendron tulipifera) began to yield nectar, but a four days' rain 
beginning May 23 put an end to nectar from this source. Nectar 
was available in small quantities from other sources during the 
latter half of April and throughout May. 
During practically the whole of June much honeydew, as well as 
pollen, was available, and for a short time after June 15 a slight 
amount of nectar from basswood (Tilia spp.) and sweet clover 
(Melilotus alba) was collected. During July little nectar came in, 
although during the week beginning July 15 a small quantity of 
pollen was brought into the hive. Beginning August 3, and through- 
out the rest of the month, pollen was carried into the hives in large 
quantities, and it was fairly abundant during September. Beginning 
September 12 and continuing until the end of that month a small 
nectar flow from various Compositae was on. October proved to be 
a period of little activity as far as pollen or nectar gathering was 
concerned. 
