Microscopical morphology of the animal body in health and disease / by C. Heitzmann. With 380 original engravings.
- Carl Heitzmann
- Date:
- 1883
Licence: Public Domain Mark
Credit: Microscopical morphology of the animal body in health and disease / by C. Heitzmann. With 380 original engravings. Source: Wellcome Collection.
Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.
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![often the api)earanci' is presented of a single granule surrounded by wreaths of other gi-anules, all the latter being united, by means of radiating conical threads, both to the central gi-anule and to each other. Such small, wheel- like bodies may arise in different i)laces in the protoplasmic body during its changes of shai)e. Besides the gi-ayish-yellow granules, there are numerous others of a more yellow color and of a gi-eater refi-acting power, identical with that of fat-gi-anules. Experience shows that such fat-gi-anules are more numerous in the latter part of the breeding season of the oyster—viz., in Jidy and August. Many of these fat-gi-anules are connected by means of delicate threads with the neighltoring ])rotoplasmic gi-anules. During the changes of shape of the blood-corpuscle, round spaces often aj>pear in the protoplasmic bodies, the so-called vacuoles. These vacuoles vary gi-eatly in size ; they are filled with the light, structureless fluid sub- stance which we see within and without the meshes of the net-work. In the fluid of the vacuoles sometimes there are gi-anules floating about. Each vacuole is suiTOunded by an extremely thin grayish-yellow layer, which is always in union, l)y means of delicate threads, with the neighboring gi-anules of the protoplasm. Sometimes several vacuoles arise within the corpuscle, and are separated fi-om each other by a continuous layer, like the shells of a nucleus, and these shells give the appearance of a frame-work. The same appearance of vacuoles, though on a considerably smaller scale, I have repeatedly observed also on nuclei originally homogeneous and structureless- looking. A continuous, though extremely thin, layer can be seen on the periphery of and closing in the protoplasmic body. The outer surface of this layer looks smooth, while its inner surface is in connection with the neighboring graniiles by means of delicate threads. While we watch a blood-corpuscle of the oyster at the common tempera- ture of the room, continuous changes of its shape are visible, as mentioned above. At the same time, changes of the net-work within take place. Tem- porarily, the gi-anules seem gi-ouped together and the meshes considerably nar- rowed ; opposite to such a gi'oup of closely packed granules flaps bulge out from the periphery of the protoplasmic body. Within a flap there is faintly visible a net-work only at the beginning of its protrusion ; very soon this net-work is completely lost to sight, and the flap looks homogeneous, and apparently structui-eless. At other times, delicate naiTow hyaline offshoots are projected from the periphery of the blood-corpuscle, varying in number, and sometimes considerably surpassing in length the diameter of the ijrotoplasmic body. These so-called false legs (pseudopodia), as a rule, look homogeneous, and run either in a straight direction or are curved and repeatedly bent. They are being projected and withdi-awn fi-equently diiring the changes of shape of the corpuscle ; sometimes they are thrown out so regularly, and in so gi'eat a number, that the corpuscle assumes a beautiful star-shape, the central body at this time being considerably decreased in size and its granules closely packed together. The offshoots may also be irregular, and the blood- corpuscle may take on a considerably elongated, iiTegularly angular, and branching shape. On the thicker parts of the offshoots the net-like structure of the protoplasm is to be seen, while their ends always look hyaline and structureless. Dui'ing the changes of shape, sometimes a number of granules melt together, thus producing the appearance of a temporary nucleus; such a](https://iiif.wellcomecollection.org/image/b21219163_0065.jp2/full/800%2C/0/default.jpg)
