sters, gave his new aspirated call, got his meat and departed. At 5 P.M. he came again with the same talk, this time taking a mouse from me. Archie was on my shoulder and Terry in my lap; they merely looked at him. He left to sun and dust, with no apparent regrets. July 13th. On each visit to the cage today of Rhody's it was noted that he announced his arrival by giving the soft kerk call--heard on no other occasions. This would seem to indicate that some especial significance or association now attaches to the cage that did not formerly exist. Since the only change that has occurred there since his first acquaintance with it is the introduction of his two offspring, it would seem--earlier comments to the contrary notwith- standing--that he does recognise, consciously or otherwise, some bond between them and himself. Incidentally this call was listened to very carefully today and seems best represented by querh or kwerrh. It is musical in quality. Scale calibration. The scales on which the young road-runners were first weighed were calibrated over a range of about 4 lbs. by using measured quantities of water. While there are some irregularities, fair concordance is afforded by assigning a value of 29.0 grams to the ounce as indicated on them instead of the actual value of 28.35. On this basis the weights of the young R.Rs (P 995) on June 18th. would have been: Archie............ 232 grams, Terry ............ 174 " Terry's present weight. Terry was weighed today when he got on the scales voluntarily. He weighed 9 ounces, or 261 grams, a gain of exactly 50%. This is at the rate of about 3½ grams per day only and seems small. Archie would not condescend to sit on the scales.