14 BEE-KEEPING FOR PROFIT 
tensity of cold without injury than can the 
developed insect. 
Anatomy of the Bee.—It is advisable that 
all bee-keepers should know something of the 
structure of the bee, of its principal organs and 
their functions. The subject is too technical 
to be dealt with at length in a volume such 
as this, but the following notes may be of 
sufficient service to rouse interest to further 
inquiry. 
Trachez.—Bees have no lungs, but in place 
of them have air-sacs, connected up by air- 
tubes or tvachee which run throughout the 
body, varying in size much as do the ‘‘veins’”’ 
of a leaf, until they are minute enough to 
serve the extremities of the insect, the antenne 
and sting. This arrangement of the air-sup- 
plying organs, general throughout the insect 
world, may have something to do with the 
hibernation, to which most are subject in a 
greater or less degree, in cold weather. 
The worker-bee is extremely sensitive to 
cold, but the queen seems far less susceptible, 
and often causes perceptible anxiety in a hive 
by wandering out of the cluster in cold weather. 
I know of one instance which came under 
my notice where the queen was very much 
alive in a hive in which all the workers were 
