In all the foregoing experiments the crossed plants were the product of a cross between distinct plants. I now selected a very vigorous plant in Table 3/20, raised by fertilising a plant of the eighth self-fertilised generation with pollen from the Chelsea stock. Several flowers on this plant were crossed with pollen from other flowers on the same plant, and several other flowers were fertilised with their own pollen. The seed thus produced was allowed to germinate on bare sand; and the seedlings were planted in the usual manner on the opposite sides of six pots. All the remaining seeds, whether or not in a state of germination, were sown thickly in Pot 7; the three tallest plants on each side of this latter pot being alone measured. As I was in a hurry to learn the result, some of these seeds were sown late in the autumn, but the plants grew so irregularly during the winter, that one crossed plant was 28 1/2 inches, and two others only 4, or less than 4 inches in height, as may be seen in Table 3/21. Under such circumstances, as I have observed in many other cases, the result is not in the least trustworthy; nevertheless I feel bound to give the measurements. TABLE 3/21. Mimulus luteus. Heights of Plants in inches: Column 1: Number (Name) of Pot. Column 2: Plants raised from a Cross between different Flowers on the same Plant. Column 3: Plants raised from Flowers fertilised with their own Pollen. Pot 1 : 17 : 17. Pot 1 : 9 : 3 1/8. Pot 2 : 28 2/8 : 19 1/8. Pot 2 : 16 4/8 : 6. Pot 2 : 13 5/8 : 2. Pot 3 : 4 : 15 6/8. Pot 3 : 2 2/8 : 10. Pot 4 : 23 4/8 : 6 2/8. Pot 4 : 15 4/8 : 7 1/8. Pot 5 : 7 : 13 4/8. Pot 6 : 18 3/8 : 1 4/8. Pot 6 : 11 : 2. Pot 7 : 21 : 15 1/8. Pot 7 : 11 6/8 : 11. Pot 7 : 12 1/8 : 11 2/8. Crowded. Total : 210.88 : 140.75. The fifteen crossed plants here average 14.05, and the fifteen self-fertilised plants 9.38 in height, or as 100 to 67. But if all the plants under ten inches in height are struck out, the ratio of the eleven crossed plants to the eight self-fertilised plants is as 100 to 82. On the following spring, some remaining seeds of the two lots were treated in exactly the same manner; and the measurements of the seedlings are given in Table 3/22. TABLE 3/22. Mimulus luteus. Heights of Plants in inches: Column 1: Number (Name) of Pot. Column 2: Plants raised from a Cross between different Flowers on the same Plant. Column 3: Plants raised from Flowers fertilised with their own Pollen. Pot 1 : 15 1/8 : 19 1/8. Pot 1 : 12 : 20 5/8. Pot 1 : 10 1/8 : 12 6/8. Pot 2 : 16 2/8 : 11 2/8. Pot 2 : 13 5/8 : 19 3/8. Pot 2 : 20 1/8 : 17 4/8. Pot 3 : 18 7/8 : 12 6/8. Pot 3 : 15 : 15 6/8. Pot 3 : 13 7/8 : 17. Pot 4 : 19 2/8 : 16 2/8. Pot 4 : 19 6/8 : 21 5/8. Pot 5 : 25 3/8 : 22 5/8. Pot 6 : 15 : 19 5/8. Pot 6 : 20 2/8 : 16 2/8. Pot 6 : 27 2/8 : 19 5/8.