. Bulletin of the Department of Agriculture. Agriculture; Agriculture. CORRELATION WITH TIME SPENT IN NURSING. The effect of these food requirements upon the amount of work necessary to be done by the nurse bees in relation to the rate of growth of the larvae and nature of the food is well illustrated by the observations of Lineburg in Part II of this bulletin. He founcl that in the time spent by nurse bees in caring for larvae there is prac- tically 100 per cent increase on the first day over that at the time of hatching from the egg. Food is never placed in the cell until soon after the
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. CORRELATION WITH TIME SPENT IN NURSING. The effect of these food requirements upon the amount of work necessary to be done by the nurse bees in relation to the rate of growth of the larvae and nature of the food is well illustrated by the observations of Lineburg in Part II of this bulletin. He founcl that in the time spent by nurse bees in caring for larvae there is prac- tically 100 per cent increase on the first day over that at the time of hatching from the egg. Food is never placed in the cell until soon after the larva hatches. On the second day this again decreases about an equal amount, but begins to increase again to a remarkable degree, particularly after the third day. From the third day on the living weight (fig. 2) and the time spent in feeding (fig. 13) show a remarkable correlation. The high point for feeding on the first day corresponds with the maximum ex- cess of unconsumed food in the cells at this time. It seems probable that the nurse bees place an excess of the predigested food in the cell soon after the egg hatches, sufficient for the larva for about two days, so that only a minimum of attention is re- quired until the change in the com- position of the food takes place, at which time increasingly greater de- mands are made by the larva for honey and pollen. Since the greatest relative increase in growth takes place during the period of uniform, highly nitrogen- ous food and the greatest storage of reserve energy-producing mate- rials occurs after the food has changed in composition it may be assumed from the observations cited that any variations in honey-flow will affect the rate of growth of the older larvae more than the younger larvae. GENERAL APPEARANCE OF LARVAE OF DIFFERENT AGES. The general appearance of larvae of different ages, particularly with reference to their size and position in the cell, provides criteria by which to judge the age of the brood. The ne
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