(6

Variation at a not very early age & Inheritance of corresponding ages comes in as the Breeder can rarely select which his animals partly grown up.─

(Antiquity of selection)

We have effects of 2 kinds of selection in diversity of Pigeons &c & Fruit ─ gooseberry & other [corn]

Wonderful amt of differences are size & all other external characters

But internal difference not selected.─ Therefore not great & not constant.

One of best evidence of power of selection is difference in fruit ─ seeds ─ foliage flowers as man desires & not in other parts - yet Correlation generally causes some difference.─

Perhaps sum up about Race-Horses & their Pedigrees & Short-horn Cattle.

(325

Concluding Remarks

[illeg]

of oxygen. This conclusion is supported by the effects of [remains of] placing a plan plants of Drosera in Carbonic acid; gas for the gas acts like a narcotic or anæsthetic, & for a time prevents bits of meat causing inflection. The process of aggregation is likewise much inflected; for when when leaves, which have been exposed for 2h to this gas, an [illeg] immersed in a solution of carbonate of ammonia the process of aggregation is much retarded. This length of exposure does not, however, The leaves did not ultimately appear to be in the least injurious to the leaves. injured by the exposure from two hours to the gas It sometimes happened that a few minutes after the plants had been being brought into the fresh air the tentacles sometimes become became rapidly inflected; & this, I presume, is due to the excitement from the access of oxygen.)

[Insectivorous plants, p. 228: "Exposure to carbonic acid for 2 hrs., and in one case for only 45 m., likewise rendered the glands insensible for a time to the powerful stimulus of raw meat. The leaves, however, recovered their full powers, and did not seem in the least injured, on being left in the air for 24 or 48 hrs. We have seen in the third chapter that the process of aggregation in leaves subjected for two hours to this gas and then immersed in a solution of the carbonate of ammonia is much retarded, so that a considerable time elapses before the protoplasm in the lower cells of the tentacles becomes aggregated. In some cases, soon after the leaves were removed from the gas and brought into the air, the tentacles moved spontaneously; this being due, I presume, to the excitement from the access of oxygen."]