[219 and 220]

Iberis umbellata

circumnutated of stem of young plant.   

Sept 13' to morning of 14th 1878

Fig 100 (1/2 scale no lettering)

Iberis umbellata: circumnutation of stem of young plant traced on horizontal from 8° 30' a.m to 10. 50' P.m Sept 13th & to 8° 30' a m. Sept. 14th Sept 15th. Distance of summit of stem beneath the Horizontal glass. 7.6 inches. Diagram half of origin size.— Tracing Amt of movement here magnified on the tracing, as given, as far as we could judge, between 4 & 5 times.

220v]

Alfred

104

Ipomoea

Ninth generation of crossed and self-fertilised Plants.

Fourteen crossed plants spontaneously self-fertilised, and fourteen self-fertilised plants spontaneously self-fertilised yielded pods capsules (the average number of seeds not having been ascertained), in the proportion of …… 100 to 26

Plants derived from a cross with a fresh Stock compared with intercrossed Plants.—

The offspring of intercrossed plants of the ninth generation— crossed by a fresh stock, compared with plants of the same stock intercrossed for during ten generations, both sets of plants left uncovered and naturally fertilised, produced capsules by weight as….. 100 to 51.

We see in the summary above table that the crossed plants however treated whether again crossed or spontaneously self-fertilised, always in some degree more productive than the self-fertilised plants. The degree differs greatly; but