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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![METHODS, THE methods of preparation of the liquid and solid constit- uents of the animal liody are of the utmost importance. Every progress in histology is largely due to an ini])rovement in the methods of i)reparation employed as well as of the optical apparatus. The main purpose obviously must l)e to examine liquids and tissues in a condition as nearly as possible like that in which they exist within the living body. The history of histologj- teaches that the greatest errors have resulted from a neglect of this rule. From the moment a specimen for examination with the microscope is allowed to dry, such a specimen has become a mummy, and unfit for further research. Almost all tissues, in former times, were allowed to dry before their minute structure was examined. The results of such researches are considered worthless nowadays. Despite of all experience gained in the last four decades,— that is, the time in which microscopic mor- phology has gradually developed into a science,— even in our day, dry bone-tissue is examined in all laboratories; but such examinations are necessarily of very small value. Another objectionable procedure is the tearing, teasing, and pulling of tissues. By such methods, the parts which in the body are connected become l)roken and disfigured, ih'hris are produced, sometimes with the greatest skill, which, as a matter of fact, are useless for fruitfid microscopic investigations. Both me- chanical and chemical isolation of the constituent parts of tissues should be used to a very limited degree only. Just as objection-](https://iiif.wellcomecollection.org/image/b21219163_0027.jp2/full/800%2C/0/default.jpg)
