MEURS H VAN (1928) Nidologisch a problem that requires solution. ENIGMATIC SYSTEM OF REPRODUCTION BY HEMIPROCNE longipennis . LIMOSA 1 (1): 23-70.

In this essay the author shows that, - where Hemiprocne longipennis, like so many other indian swifts, builds a nest of the swallow-nest type (viz. stuck to something sideways) but builds it in trees, not under a covering, which has to protect the nest from getting wet and falling off, -the nest of this bird must necessarily be so small that it (i.e. the bird) can. entirely cover it, and, by doing 80, can itself form the required covering.
      From this it follows that this very elaborate nidological system has probably not arisen in an evolutionary sense, but must have come into existence suddenly and quite complete. This is i.a. suggested, as the author proves, by the very definite construction required for the building of this miniature nest, which construction cannot have developed gradually from another construction.
      The author, while carefully and scientifically analysing the complicated and ingenious nidological system of the bird mentioned, further shows that the numerous details characterizing that system, find their explanation in he above thesis.

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