. Dansk botanisk arkiv. Plants; Plants -- Denmark. Dansk Botanisk Arkiv, Bd. 2 Nr. 10. several other investigators often have found the corpusculum fixed upon the pulvillus. Without a microscopic observation, at any rate, it cannot be decided, where the corpusculum is fixed, and we may add that this observation must be very careful. At a cursory obser- vation under the microscope, it may often appear as if the corpus- culum is fixed upon a claw, even if it is fixed upon the pulvillus. Nevertheless one ought perhaps to accept the various observations of the situation of the corpusculum upon the
. Dansk botanisk arkiv. Plants; Plants -- Denmark. Dansk Botanisk Arkiv, Bd. 2 Nr. 10. several other investigators often have found the corpusculum fixed upon the pulvillus. Without a microscopic observation, at any rate, it cannot be decided, where the corpusculum is fixed, and we may add that this observation must be very careful. At a cursory obser- vation under the microscope, it may often appear as if the corpus- culum is fixed upon a claw, even if it is fixed upon the pulvillus. Nevertheless one ought perhaps to accept the various observations of the situation of the corpusculum upon the foot of the insect as holding good severally, if it were not possible to approach the question still more, viz. by trying if it is possible to fix the corpusculum upon a claw. It is easy enough to make the ex- periment bypassing a claw up through the fissure of the anthers. By this ex- periment one may, it is true, pull out the corpus- culum, but I at least have never succeeded in making the corpusculum fix upon a claw. The reason of this I believe to be, partly,that a certain flexibility of an organ is required to enable it to pass up through the fissure of the corpuscu- lum, the edges of the lat- ter over lapping, and this flexibility the stiff claw does not possess, partly, that the claw most probably is too clumsy to be able at all to pass through the tiny fissure of the corpusculum. It remains to discuss Robertson's finding corpuscula upon the stiff hairs of the foot. None of the naturalists, who have in Europe examined the insects that pollinate A. cornuti, have found corpuscula upon the stiff hairs of the foot of the insect. In the bot. garden of Copenhagen I found corpuscula fixed upon the foot of bees above the claws; these corpuscula, however, were not fixed directly upon the stiff hairs, but upon appendages of corpuscula of Asclepias incarnata, which were in their turn fixed upon the stiff brushes. The species A. incarnata is growing next to A. cornuti. Fig. 1.
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