The Marcus Beck Laboratory reports.

Date:
1914
Catalogue details

Licence: In copyright

Credit: The Marcus Beck Laboratory reports. Source: Wellcome Collection.

    39/86 (page 37)
    points of difference from each other which remain with them regardless of the medium or environment. (3) Complete uninjured portions of chick embryonic tissue grow to some extent in vitro under somatic control. (4) The chick spleen in embryonic life at least is capable of pro- ducing red corpuscles as well as various forms of leucocytes. (5) The extract of one species of animal tissue appears in certain cases to stimulate the growth of tissue from an animal of different species, whereas in other cases the converse seems to hold good. (6) Extracts of certain tissues deposit stars of crystals resembling tyrosine when kept in the incubator for a period of two weeks and upwards. Addendum. By permission of the President, at the conclusion of the foregoing report. Dr. H. D. McCulloch, demonstrated, by means of the kine- matograph, cytogenesis and histogenesis in embryo chick’s heart tissue and spleen tissue, including their accessory free cells, in vitro. Dr. McCulloch said :— Last winter I suggested to Dr. David Thomson the importance of using the kinematograph in connexion with cytological research. On seeing the announcement of the reading of the extremely interesting report by Dr. J. G. Thomson, to which you have just listened, I thought this might be a good opportunity for again urging my plea before the Society. Having obtained the series of films from Dr. J. Comandon, of the Pasteur Institute, I decided to make an attempt to interpret some of the less conspicuous phenomena that are to be observed, and to indicate the direction in which further cytological research might with advantage be pursued. With your permission, and that of the author, I will pro- ceed to do so. These tissues were photographed when several days old, after cultivation upon coagulated plasma by Harrison and Burrows’s method, the same as is employed by Carrel. The first series shows a fragment of the embryo chick’s heart, in which energy is seen being expended by a continuance of the characteristic rhythmic contractions of that organ. How far do these contractions conduce to hypertrophy or growth of the muscle cells, and how far is the growth vegetative and embryonal ? Again, there would