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Geotropism evident after 6º or 8º (in 2 lots) & subsequently after 21º or 23º increased greatly so the at roots vertically down down or very nearly nearly so No I, 8, 9, (13, after 8º at 45º after 23º reversed in same position.

Geotropism after 21º or 23º (& not at earlier hours) & w)

✔ nor. 4 after 21º angle of 45º & laterally quite vertical aft 45º

✔ 5. — quite vertical after 21º

7. after 23 terminal about 45º

12. after 23 almost perpendicular.

Retaining for some time Horizontal Position

(3) after 21º almost horizontal, but bent laterally, after 30º vertical.

(11) after 23º still horizontal

Then describe the 3 more remarkably cases.

(2) (13) (6) (10)

Geotropism prevailed ultimately in every case long enough observed, but much delayed in some of them, & a curious struggle went on.—

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Phlox subulata Ch III

stands nearly in the throat of the corolla; whilst in the short-styled it is placed low down—sometimes very low within the throat, for it varies greatly in position. In this latter form the stigma often is more papillose, & longer than that of the long-styled forms, of greater length (in one instance in the ratio of 100 to 67), in the short-styled flowers than in the long-styled. My son measured 20 twenty pollen-grains from a short-styled flower, and of 9 nine from a long-styled, and the former were in diameter to the latter as 100 to 93; & this difference accords with the belief that the plant is heterostyled. But the grains from the short-styled varied much in diameter. He afterwards measured 10 ten grains from a distinct long-styled flower, and 10 from another plant of the same form, & these grains though appertaining to the same form differed in diameter as in the ratio of 100 to 90.

The mean diameter of these two lots of twenty grains was to that of twelve grains from another short-styled flower as 100 to 75; here, then, the grains from the short-styled form were considerably smaller than those from the long-styled, which is the reverse

[158]

Dates always from attachment of sqr.

(1) ✔— after 6º a little geotropic — after 21º greatly geotropic — after 30º vertically down.

(2) after 6º a little geotropic — after 21º kinked upwards— after 50' 45º' terminal portion vertically down so had made loop.

(3) ✔ after 21º almost horizontal, but bent from card a little laterally: after 30º terminal vertically down.

(4) ✔ after 21º bent down at about 45º, but also laterally — after 21º much more perpendicular & after 45º quite vertical.

(5) ✔ after 21º down & perpendicular so geotropism prevailed through

(6) after 6º a little geotropic — after 21º strongly contorted, for in the interval had risen & apex again bent down to angles of about 45º— after 30º terminal portion vertical.

(7) ✔ after 8º no geotropism: after 23º terminal about 45º

(8) ✔ after 8º slightly geotropic: after 23 terminal perpendicular

(9) ✔ after 8º….. do. almost perpendicular

(10) after 8º tip slightly geotropic: after 23º had risen above horizon & curled back towards the seed— if longer observed no doubt geotropic (like 6)

(11) after 8º no action & aft 23º still horizontal

(12) ✔ after 8º no geotropism action after 23 almost perpendicularly down.

(13) ✔ after 8º considerable geotropism ie 45º beneath Horizon — after 23º remained in same position.

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Phlox subulata Ch III

(Phlox subulata (Polemoniaceæ)) Prof Asa Gray informs me, that greater number of the species in this genus have a long pistil, with the stigma more or less exserted; whilst several other species, especially the annuals, have a short pistil included seated low down within the tube of the corolla. In all the species the anthers are arranged one below the other in the tube, the uppermost was just protruding from the throat of the corolla. In Phlox subulata alone Asa Gray he has "seen both long & short styles; & here the short-styled plant has (irrespective of this character) been described as a distinct species (P. nivalis, P. Hentzii), & is apt to have a pair of ovules in each cell, while the long-styled P. subulata rarely shows more than one."* (*Proc American Acad of Arts & Sciences June 14 1870 p 248)

Some dried flowers of both forms were sent me by Asa Gray, & I received others from Kew, but I have failed to make out whether it is heterostyled. In two flowers of nearly equal size, the pistil of the long-styled form was that twice as long as that of the short-styled; but in other flowers there was no such differences in other case. The stigma of the long-styled pistil