Selected monographs.

  • New Sydenham Society
Date:
1888
Catalogue details

Licence: Public Domain Mark

Credit: Selected monographs. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

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    of a membrane might be discerned (Table II., fig. 1, b). Finally, some long and tortuous filaments were like those of fig. 7, which contained a notable quantity of brilliant granules (Table II., fig. 1, d). In these last an extraordinarily rapid development was observed, for whilst fig. d represented exactly such a filament as seen at midday (April 15), the same filament had at 2 p.m. assumed the appearance of d'; that is to say it had increased to almost double the length, had become larger, and contained a quantity of shining corpuscles, which, especially at the fine extremity, had accumulated so as to give to the proto- plasm a much more granular appearance than appears in the figure. Two principal forms, therefore, prevail—homogeneous filaments with commencing scission, and others producing spores, in some of which the protoplasm had become granular. It was only by continued observations of the preparation that it was possible to decide that the two forms were connected. A third form (Table II., fig. 1, e) consisted of fusiform cells containing very large protoplasmic masses, of which examples are seen in this preparation, belonging to another organic series, and dis- appearing as the others developed. The same cultivation examined April 16th, after having been constantly maintained at a temp. 30°—34°, showed a large quantity of very long filaments with many granules, and others with homogeneous protoplasm sometimes arranged parallel to one another, and in some of which were seen manifold transverse divisions (Table II., fig. 3). April 17th, 9 a.m., were found, in addition, very numerous tortuous filaments, especially at the edge of the air channel, the short rods containing two or three nuclei (fig. 7, c, and fig. l,f), which the day previous had been observed at points accurately noted, were no longer visible. Instead, the forms were found which are depicted Table II., fig. 2, as shown by the l-12th inch objective of Zeiss (oil immersion). The smaller figure represents these same shown with eyepiece No. 0 of Zeiss, and the other two as seen with eyepiece No. IV. They were jointed filaments, each joint of which was limited by a membrane even at the points of division. The smaller of these had a homogeneous protoplasm ; the larger contained a grannie, very large, oval, shining, and attached to the wall about the middle; or Wo granules, smaller, and rounded at the ends; or a median and two terminal granules. Some observations have