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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![STurcrrui': of coloih-:]) iu.ood-coki'USCles. (m llaviuji iiKulc a uuiuIxt of meiisuri'iiicuts, 1 can state that in I'verv person's hlood that I have examined, there are some as small as, or smaller than, the j^y-;, and in nearly every j)erson's some as lary;e as, or larger than, the ^t'cT *'^ ^^^ ineh in diameter (i. ('., .OCX));) and .00917 mm.), with transitional sizes between these. The extremes are sometimes not met with in eacth field of a drop, nor even in every drop of a person examined; hut I have not found any adult of either sex from whose blood the smaller extreme was al)sent, and only i'ery few without the larger. I have repeated the measurements of blood-corpuscles without the addition of the re-agent, both with and without oiling the edges of the covering-glass,— /. e.^ with and without preventing the ordinarily rapid evaporation,—with practically the same results; drying of course contracts blood-corpuscles, and cor- responding variations are observed. Some of the disks are in outline not perfectly circular; by measuring the largest diameter of the largest and the smallest diameter of the smallest disks, the extremes I have met with in one and the same specimen of human- blood are, as to the smallest, about the goVo? '^^^ ^^ to the largest, the a^-Vo? ^^ ^^ inch fi e., .00422 and .01016 mm.). If the detached globules, which I shall describe, be counted as blood-corpuscles, there are even still smaller ones. In each speci- men of blood, the majority of red corpuscles, however, are of about one size, which differs in different specimens, but is most fre- quently between the ifg-Vs and the ^tju) of ^^ i^ich (.006.).)—.00819 mm.), or somewhere about the g^yg of an inch (.0075 mm.). The calculated average of the size of the red coi'puscles in a drop— i. e., the arithmetical mean of the measurements—is usually a little higher than the size of the majority of the corpuscles. A very few, especially the smallest, but occiu'ring exception- ally also among the larger, seem more or less globular; all others are bi-concave disks, the periphery being more shining and thick than the central portion. So-called rosette and thorn-apple forms may be seen, either immediately or in the course of a little while. I have often watched the individual corpuscles while these forms, and many others, were being produced ; and in Part III. of this communica- tion I shall offer an explanation of their production. Concentrating our attention upon the shape of the circular disks, we soon find that the round outline of a few (and the same is at times also true of the smooth sm-face) begins to be made](https://iiif.wellcomecollection.org/image/b21219163_0091.jp2/full/800%2C/0/default.jpg)
