28 THE AEEANGEMENT OF THE 



Blood-corpuscles in which nuclei of the above description had 

 originated, did not materially change their shape, even if the 

 temperature was raised up to 35 deg. C. (91 deg. F.) ; the only 

 noticeable change consisted in a temporary bulging from the 

 periphery of the corpuscle, of a hyaline flap which slowly increased 

 in size. In such a flap, no structure was perceptible, but some- 

 times very small vacuoles, which were invariably inclosed by a 

 somewhat denser, slightly shining substance. 



Colostrum Corpuscles. The colostrum, as is well known, holds 

 a variable number of protoplasmic lumps, which sometimes 

 contain fat-granules, and, as first demonstrated by S. Strieker,* 

 upon raising the temperature up to 40 deg. C. (104 deg. F.), 

 change their shape and location therefore are alive. If we 

 look, with an amplification of an immersion-lens, No. 15 of 

 Hartnack, at a pale lump ever so small, which, with lower powers 

 appears to be structureless, we find in every one of them, even 

 though a nucleus be wanting, a reticulum identical with that of 

 a colorless blood-corpuscle. The points of intersection of the 

 reticulum are granules, either very small and pale gray, or 

 somewhat larger and glistening. Some granules exhibit the 

 peculiar luster of fat, but are in connection with the rest of the 

 corpuscle by means of delicate filaments. Larger droplets of fat 

 apparently lie isolated in the mesh-spaces. The author named 

 has proved that granules of fat may be discharged from the 

 protoplasma during its contractions. 



In the foregoing, I have collected a number of facts, observ- 

 able by every one who has a well- versed eye and a good lens. I 

 now proceed to draw conclusions from my observations. 



First, it is obvious that a reticulum in protoplasm, as con- 

 ceived but not seen by E. Briicket and S. Strieker, :f is visible. 

 The protoplasm, therefore, is not structureless, but has a reticular 

 structure, and the granules are not foreign, but belong to living 

 protoplasm, being the points of intersection of the reticulum. 



The Nudeolus, the Nucleus, and the Granules, with their Con- 



* Ueber contractile Korper in der Milch der Wochnerin. Sitzungsber. der 

 Wiener Akad. d. Wissensch. 1866. 



t Ueber die sog. Molecularbewegung in thierischen Zellen, iiisonderheit 

 in den Speichelkorperchen. Sitzungsber. d. Wiener Akad. d. Wissensch. 

 1863. 



t Untersuchungen iiber das Leben der farblosen Blutkorperchen des 

 Menschen. Sitzungsber. d. Wiener Akad, d Wissensch. 1867. 



