Abstract
SOME time ago, when I read an account of Prof. Weismann's experiment on the larvæ of blow-flies, as described in his Romanes lecture, a criticism of it occurred to me, which I have, recently communicated to Mr. Herbert Spencer. This was that in the experiment the quantity of food (flesh) was diminished, while the nature of it remained the same; whereas in the case of bees it is well known that the difference between the food of the worker larvæ and the royal lavæ is one of quality, not of quantity. The royal food is pollen, and is highly nitrogenous, while the food of the worker larvæ is chiefly honey. In the case of Termites, Grassi has found that the fertile individuals are fed during development on the secretion of the salivary glands of other individuals, while the sterile forms are supplied only with macerated wood-dust.
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