Among the Primate bloods that of the Chimpanzee gave too high a figure, owing to the precipitum being flocculent and not settling well, for some reason which could not be determined. The figure given by the Ourang is somewhat too low, and the difference between Cynocephalus sphinx and Ateles is not as marked as might have been expected in view of the qualitative tests and the series following. The possibilities of error must be taken into account in judging of these figures; repeated tests should be made to obtain something like a constant. Other bloods than those of Primates give small reactions or no reactions at all. The high figures (10%) obtained with two Carnivore bloods can be explained by the fact that one gave a loose precipitum, and the other was a somewhat concentrated serum.[44] [44] Nuttall, _Blood Immunity and Blood Relationship_, pp. 319 and 320. We have mentioned that even the proteins of the egg are specific according to Uhlenhuth. Graham Smith, one of Nuttall’s collaborators, applied the latter’s quantitative method to this problem and confirmed the results of Nuttall. A few examples may serve as an illustration. TABLE III TESTS WITH ANTI-DUCK’S-EGG SERUM --------------------------------+--------------+-------------- _Material tested_ | _Amount of | _Percentage_ | precipitum_ | --------------------------------+--------------+-------------- Duck’s egg-albumin | .0384 | 100 Pheasant’s " | .0328 | 85 Fowl’s " | .0234 | 61 Silver Pheasant’s " | .0140 | 36 Blackbird’s " | .0065 | 15 Crane’s " | .0051 | 14 Moorhen’s " | .0046 | 12 Thrush’s " | .0046 | 12 Emu’s " | .0018 | 5 Hedge-Sparrow’s " | trace | ? Chaffinch’s " | . | 0 Tortoise serum | trace | ? Turtle serum | " | ? Alligator serum | . | 0 --------------------------------+--------------+-------------- Frog, Amphiuma, and Dogfish sera, as well as Tortoise and Dogfish egg-albumins, were also tested, with negative results. TABLE IV TESTS WITH ANTI-FOWL’S-EGG SERUM