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But gradually the researches of such accurate observers as Unger, Nageli, Kolliker, Reichart, and Remak tended to confirm the opinion of Von Mohl that cells spring only from cells, and finally Rudolf Virchow brought the matter to demonstration about 1860. His Omnis cellula e cellula became from that time one of the accepted data of physiology.
But there were few people in the room, and we were none of us inspired. I must sadly put down that Friday evening among the lost opportunities of life. For Mrs. Simpson's biography of Madame Mohl shows what a wealth of wit and memory there was in that small head! Her social sense, her humor, never deserted her, though she lived to be ninety.
The first purpose of the spontaneous revolving movement, or, more strictly speaking, of the continuous bowing movement directed successively to all points of the compass, is, as Mohl has remarked, to favour the shoot finding a support. This is admirably effected by the revolutions carried on night and day, a wider and wider circle being swept as the shoot increases in length.
For it was held, according to the French tradition, and in Paris, by an Englishwoman. It was, I think, Max Mueller who gave us an introduction to Madame Mohl. She sent us an invitation to one of her Friday evenings, and we duly mounted to the top of the old house in the Rue du Bac which she made famous for so long.
After a tendril has spontaneously revolved for a time, it bends from the light towards the dark: I do not state this on my own authority, but on that of Mohl and Dutrochet. The young internodes revolve spontaneously; but the movement is unusually slight. A shoot faced a window, and I traced its course on the glass during two perfectly calm and hot days.
Von Mohl called attention to the fact that this motion of the cell contents had been observed as long ago as 1774 by Bonaventura Corti, and rediscovered in 1807 by Treviranus, and that these observers had described the phenomenon under the "most unsuitable name of 'rotation of the cell sap." Von Mohl recognized that the streaming substance was something quite different from sap.
All the authors, except Palm and Mohl, who have discussed the spiral twining of plants, maintain that such plants have a natural tendency to grow spirally. Even before reading Mohl's interesting treatise, this view seemed to me so probable that I tested it in every way that I could, but always with a negative result.
But these sub-divisions graduate into each other, as we shall see under Corydalis and the Gloriosa lily. Palm and Mohl class these plants with those which bear tendrils; but as a leaf is generally a defined object, the present classification, though artificial, has at least some advantages. Leaf-climbers are, moreover, intermediate in many respects between twiners and tendril-bearers.
Now they sleep far apart, one in the Pantheon of ancient Rome, in the midst of the Italian people, who hold his name in everlasting honor; the other in an exile's grave in England, with a name upon it that is execrated from Boulogne to Strasburg, and from Calais to Marseilles. Thackeray's family in Paris. Madame Mohl. Her husband's encouraging theory about learning languages. Mr. Scholey.
It is noteworthy that the epic element was and is preserved with persistence by the Parsis. Mohl notes that the majority of Persian epic poems, excepting the Shah Nameh, has been preserved only in manuscripts belonging to Parsis . Farther development of this phase of Persian literary tradition bifurcated into two directions.
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