TABLE III

Tests with Anti-Duck’s-Egg Serum

Material testedAmount of
precipitum		Percentage
Duck’segg-albumin.0384100
Pheasant’s   ".0328185
Fowl’s   ".0234161
Silver Pheasant’s   ".0140136
Blackbird’s   ".0065115
Crane’s   ".0051114
Moorhen’s   ".0046112
Thrush’s   ".0046112
Emu’s   ".0018105
Hedge-Sparrow’s   "trace10?
Chaffinch’s   "·100
Tortoise serumtrace10?
Turtle serum"10?
Alligator serum·100

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

Material testedAmount of
precipitum		Percentage
Fowl’segg-albumin (old).0159100
Fowl’s   "   (fresh).0140188
Silver Pheasant’s   ".0075147
Pheasant’s   ".0075147
Crane’s   ".0046129
Blackbird’s   ".0046129
Duck’s   ".0037123
Moorhen’s   ".0028118

Thrush, Emu, Greenfinch, and Hedge-sparrow egg-albumins were tested and gave traces of precipita, as also did Tortoise and Turtle sera. The egg-albumins of the Tortoise, Frog, Skate, and two species of Dogfish did not react. Alligator, Frog, Amphiuma, and Dogfish sera also yielded no results.[45]

By improving the quantitative method in various ways, Welsh and Chapman[46] were able to explain why the precipitin reac­tion with egg-white was not strictly specific but gave also, though quanti­tatively weaker, results with the egg-white of related birds. They found that by a new method devised by them “it is possible to indicate in an avian egg-white antiserum the presence of a general avian antisubstance (precipitin) together with the specific antisubstance.”