tent of as much as two ounces. Also Archie does not like them, T, on the other hand, considering them delightful sources of amusement. About the most that can be said is, that insofar as these scales are concerned, there appears to have been no certain change in the weight of either bird, one way or the other, since previous weighing. Repeated weighings on Terry today, "judgmentally averaged", gave 11 oz., the same as on July 31st. (319 gms). At that time Archie was "unweighable". One very unreliable one on Archie today might be interpreted as being 14oz., or equivalent on these scales to 406 grams. This gives a difference between them of 87 grams. Looking back to page 1009, I find it is identical with the figure at that time. This, however, can only be ascribed to accident, although the relative weights of the two birds may be fairly cor- rectly indicated. In any case, this weighing tends to confirm visual conclusion that there has been little growth of these birds in the last few weeks. Terry "barks". With Archie sitting on top of my hat and Terry on my shoul- der, the latter espied somebody approaching a hundred feet away and suddenly emitted a loud, strikingly dog-like sound evidently intended to be heard at a distance: Wuh, Woo-o-o-h! The first sound like this heard from any road-runner here, and to date, the one and only. August 20th. It was noted herein in the beginning of my experience with the two young road-runners that they, more especially Terry, reacted in a peculiar way to the sound of the human voice when they spoken to in an otherwise silent period and when, themselves, were in repose, more or less. The reaction consisted in shaking the head sidewise once or twice with short, quick movement and then stopping only to repeat when again addressed. Experiment showed