CHAP.XXXV.] MR. SIMON'S RESEARCHES. 523 



pose, and consequently the thymus soon disappears. Professor 

 Paget and Dr. Handfield Jones express themselves in favour of 

 this latter view, l^i the present state of our knowledge, perhaps 

 no better hypothesis of the office of this gland can be suggested. 

 The whole subject of the physiology of the vascular ductless glands 

 (if glands they be) is involved in deep obscurity, and it is impos- 

 sible to form a theory of their respective functions which is per- 

 fectly satisfactory. Not less obscure are their morbid conditions, 

 upon which the improved anatomy of the last few years has thrown 

 but little light. 



The Student is referred to the following works for a more detailed state- 

 ment of the various views now held upon the anatomy and physiology of the 

 vascular glands. 



Spleen. Kolliker's " Mikroskopische Anatomic," and the Article "Spleen," 

 in the Cyclopaedia of Anatomy and Physiology ; Ecker's Article. " Milz," in 

 Wagner's Handworterbuch ; Sanders (l On the Structure of the Spleen," in 

 the Annals of Anatomy and Physiology; Bennett "On Leucocythemia ;" 

 Mr. Gray's Astley Cooper's Prize Essay upon the " Structure and Use of the 

 Spleen," 1854; Mr. Simon's Astley Cooper's Prize Essay on the "Thymus 

 Gland," 1845; also his. paper upon the "Thyroid," Phil. Trans., 1844; 

 Dr. Handfield Jones' Articles "Thymus" and " Thyroid," in the Cyclopaedia 

 of Anatomy and Physiology. 



M M 2 



