LYMPHATIC GLANDS. 253 



SECT. 19. Numberless small, white, solid particles, resem- 

 bling in size and shape those central particles (see Notes en, 

 cv, and cxxn,) found in the vesicles of the blood, are to be 

 seen distinctly gliding down on the stage of the microscope, and 

 if we dilute it sufficiently, we can examine them separately, and 

 view them as distinctly as we can the particles of the blood. 



SECT. 20. These particles found in the lymphatic glands 

 likewise agree remarkably in their properties with the central 

 particles found in the vesicles of the blood, not only as to size 

 and shape, but also in being insoluble in serum, or a solution 

 of any of the neutral salts in water, (except putrefaction takes 

 place,) and are, like the blood, soluble in water, and in the 

 same order (cxxn). These particles are by the lymphatic 



(cxxn.) As to the solubility in water of the nucleus of the blood 

 corpuscle, Falconar speaks more decidedly than Hewson, who states a 

 that it is less soluble than the envelope. The truth is, that the nucleus, 

 like the globules of chyle and lymph, is insoluble in water. The partial 

 effect of water on the envelope is described in Notes xciv and en. 



The globules of lymph and chyle, as well as those in the fluid of 

 the thymus, appear delicately granulated on the surface; they are 

 generally globular or lenticular, never following the wide peculiarities 

 in shape and size of the blood-discs of different classes of animals, nor 

 in birds at all approaching the long oval figure of the nucleus of the 

 red blood-corpuscle, described in Note cv. 



In the Napu musk-deer the lymph-globules are about as large as 

 those of mammals with blood-discs of the ordinary size ; and in the 

 Camelidse, as noticed more fully in the Appendix to Gerber's * Anatomy,' 

 p. 99, figs. 286, 287, and in the 23d vol. of the ' Med. Chir. Trans- 

 actions/ pp. 25 et seq., the corpuscles of the fluid of the thymus and 

 of the lymphatic glands, as well as the pale globules in the blood and 

 pus, have all the same round shape as in mammals with circular blood- 

 discs ; and so have the globules of the lymphatic glands of birds, as 

 well as the pale globules of the blood of birds and reptiles. Figures 

 of all these globules are given in my Note to Dr. Willis's translation of 

 Wagner's 'Physiology,' pp. 250-52, and to the English edit, of Gerber's 

 'Anatomy/ figs. 277-87, and 292 ; and in the 'London and Edinburgh 

 Philosophical Magazine/ June, 1842, pp. 480-84. Measurements of the 

 globules will be found in the Tables at the end of chap, i, pp. 243-4. 



The globules of the chyle, of the thymus-fluid, and of lymph, are 

 smaller and differ in structure from the pale globules of the blood. In 

 these last there are two, three, or four nuclei, easily seen when the 

 envelope is made more or less transparent or invisible by acetic, sul- 

 phurous, citric, or tartaric acid. But the globules of chyle, of lymph, 

 and of the thymus fluid, like the nuclei b of the red corpuscles of the 



a Chapter I, pp. 224-5. b See Notes cv, en. 



