Page:Proceedings of the Royal Society of London Vol 60.djvu/508

474 (b) That these young nerve fibres originate within the old sheath of Schwann from the protoplasm and nucleus of the interannular segment. The spindle-cells formed from the protoplasm and nuclei of the interannular segments elongate and unite to form protoplasmic threads, with the elongated nuclei attached to their sides. The central portion of the protoplasmic thread develops into the axis cylinder, while myeline is deposited in drops in the protoplasm surrounding the newly formed axis-cylinder. The protoplasm in which the myeline is deposited remains with the nucleus as the neuroblast of the new interannular segment. (c) That so long as conductivity of the nerve is not re-established, the development of the fibres proceeds only to a certain stage, and as the new fibres three months and eighteen months subsequent to division present identical characters, this stage may be regarded as a resting stage, depending for its further development on re-establishment of function. (d) That cicatricial intercalary segments reuniting the ends of a divided nerve may be permeated by young fibres from end to end without re-establishment of function, if the amount of cicatricial connective tissue present in the mass is sufficient by its pressure to prevent the passage of impulses.

Proceedings and List of Papers read.

The LORD LISTER, F.R.C.S., D.C.L., President, in the Chair. A List of the Presents received was laid on the table, and thanks ordered for them.

The following Papers were read :—

I. On the Iron Lines present in the Hottest Stars. Preliminary Rote.” By J. N orman L ockyer, C.B., F.R.S.

II. On the Significance of Bravais’ Formuhe for Regression, &c., in the case of Skew Correlation.” B y G. U dny- Y ule. Communicated by Professor K arl P earson, F.R.S.

III. Mathematical Contributions to the Theory of Evolution. On a Form of Spurious Correlation which may arise when Indices are used in the Measurement of Organs.” By K arl P earson, F.R.S., University College, London.

IV. “ Note to the Memoir by Professor Karl Pearson, F.R.S., on Spurious Correlation.” By F rancis Galton, F.R.S.