Minute Anatomy of AnmaU. 481 



smaller than the pale globules of the blood; and, as I have 

 noticed in the Appendix to Gerber's Anatomy, the same fact 

 is observable in the mammalia. Yet the descriptions given 

 since Hewson's time of the lymph-globules of birds have 

 always been drawn from the pale globules of their blood. 



The distinguished inquirer just mentioned States that the 

 particles of the fluid of the lymphatic glands of birds are oval, 

 like the nuclei of their blood-corpuscles. In the Philosophi- 

 cal Magazine for February 1840, 1 gave an account of the 

 lymph-globules of the Musk Deer, from which it appears 

 that these scarcely differ in size from those of man, not- 

 withstanding the blood-discs of this little ruminant are the 

 smallest at present known ; and although the Camelidte have 

 oval blood-corpuscles, I found that the globules of the thymus, 

 of the lymphatic glands, and of the pus of these animals, had 

 the usual circular figure, and nearly the same size as the cor- 

 responding globules in other mammalia*. It was to be ex- 

 pected therefore that the lymph-globules of birds would pos- 

 sess a similar form, and this I have lately ascertained to be 

 the case. The annexed figure represents particles from the 

 Magpie, all of which are magnified exactly to the same de- 

 gree, to wit, about 800 diameters. 



A shows the lymph-globules in the juice of a lymphatic 

 gland from the neck ; also smaller circular particles, proba- 

 bly free nucleoli: B, four pale globules from the blood of 

 the heart : C, one perfect blood-disc and two detached nuclei, 

 the latter exposed by dilute acetic acid : D, portion of the 

 pulp of the spleen chiefly composed of cell-nuclei, vez-y similar 

 in all respects to the globules of lymph : this representation 

 will be referred to in a future communication. 



The lymph-globules of birds are commonly rather smaller 

 than those of mammalia, yet this difference of size is not ob- 



* See Medico-Chir. Trans., vol. xxiii. ; and Lancet, 1840-41, vol. ii. p. 101. 

 Fhil. Mag. S. 3. Vol. 20. No. 133. June 1842. 2 K 



