The blood-corpuscle considered in its different phases of development in the animal series / by T. Wharton Jones.

  • Jones, Thomas Wharton, 1808-1891.
Date:
1846
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Licence: Public Domain Mark

Credit: The blood-corpuscle considered in its different phases of development in the animal series / by T. Wharton Jones. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    18. The conclusion to be drawn from what has now been said in regard to the relationship between the granule blood-cell and the nucleated blood-cell is, that they are to be viewed as two different phases of development of the same body, the granule- cell being the first phase of development, the nucleated cell the second phase of development. Each phase of development again comprehends two principal stages: the phase of granule-cell, a coarsely and finely granular stage; the phase of nucleated cell, an uncoloured and, a coloured stage. 19. In the osseous fishes which I have examined for the purpose, the blood-cor- puscle in its phases and stages of development is essentially the same as in the Skate. In the Lamprey also, which is a cartilaginous fish lower in the scale than the Skate, the blood-corpuscle in its phases and stages of development is the same, with the exception that the nucleated cell in its coloured stage is circular, as well as that in the uncoloured stage (figs. 4 a, 3.)*. 20. It is worthy of remark, however, that there is a fish, the lowest of the lowest division, in which the blood is perfectly colourless, viz. Branchiostoma luhricum,f Costa, Amphioxus lanceolatus, Yarrell-}\ The corpuscles of the blood of this fish have not been examined, but there can be little doubt that some of them are the same as the granule blood-cells of the Skate or Lamprey, and others the same as the nucleated blood-cells in their uncoloured stage. If this be so, the blood of Bran- chiostoma luhricum would differ from that of other fishes, merely in the absence of nucleated cells in the coloured stage. It is quite possible, however, although the blood appears perfectly colourless, that nucleated cells in the very commencement of the coloured stage may exist. 21. From Fishes I now proceed to Reptiles, and as an example of a Reptile I take the Frog, in which to examine the blood-corpuscle. Examination of the Blood-corpuscles of the Frog, and a comparison of them with those of the Shate. 22. In the blood of the Frog, as in that of the Skate, the following kinds of cor- puscles are to be recognised granule-cells and nucleated cells; the former in coarsely and finely granular stages, the latter in uncoloured and coloured stages. 23. What are usually spoken of under the names of “lymph,” or “colourless” corpuscles, are the granule-cell in both its stages, and the nucleated cell in its un- coloured stage. The relation of these corpuscles to the lymph will be considered in Part Second of this paper ; here I view them as corpuscles existing in the blood, and therefore as blood-corpuscles : blood-corpuscles, moreover, differing from each other * Professor Rudolph Wagner was the first to point out the circular form of the red blood-corpuscle of the Lamprey, but he does not appear to have noticed the existence of a nucleus. f Muller, Mikroskopische Untersuchungen iiber der Bau und die Lebenserscheinungen des Branchiostoma luhricum, Costa, Amphioxus lanceolatus, Yarrell. Auszug aus dem Monatsbericht der konigl. Preuss. Aka- demie der Wissenschaften zu Berlin, Dec. 1841.