THE TRUE CiECAL APEX, OR THE VERMIFORM APPENDIX. 99 



LIST OF ILLUSTRATIONS. 



Of the 50 plates prepared for the illustration of this article the 

 following 20 have been selected for publication : — 



(1) Rodentia — Lepus nmiculus, the rabbit. A transverse section 

 through the vermiform appendix of a rabbit. To illustrate the lym- 

 phoid tissue projecting inwards towards the lumen of the gut, between 

 the villi. 



(2) A longitudinal section through the apex of the vermiform 

 appendix of a full-term foetal rabbit. 



(3) Carnivora — Felis domesticus, the cat, A longitudinal section 

 through the caecal apex of an adult cat. To illustrate the lymphoid 

 tissue collected into germ centres. 



(4) A transverse section through the large intestine of an adult cat. 

 To illustrate the comparative absence of lymphoid tissue as compared 

 with fig. 3. 



(5) A transverse section through the ca^um of a full-term foetal 

 kitten. 



(6) A transverse section through the caecum of a two-day-old 

 kitten. 



(7) A longitudinal section through the csecal apex of a four-day-old 

 kitten. 



(8) A longitudinal section through the cacal apex of a seven-day- 

 old kitten. 



(9) A transverse section through the small intestine of a kitten. 

 To illustrate the comparative absence of lymphoid tissue in the small 

 intestine of a kitten, as compared with the caecal apex. 



(10) Ayes— Columba livia, the pigeon. A longitudinal section 

 through the large intestine and one of the two caeca of a pigeon. 



(11) Aves — Gallns domesticus, the domestic fowl. A high-power 

 view of a transverse section through the middle of the caecum. To 

 illustrate the.diffusion of the leucocytes throughout the mucosa. 



(12) A longitudinal section through the caecal apex of the domestic 

 fowl. 



(13) Aves — Anser, the common goose. A transverse section 

 through part of the large intestine, and through the whole of one of 

 the two long caeca of the common goose. To illustrate the large 

 amount of lymphoid tissue contained in the caecal wall, as opposed to 

 the small amount contained in the wall of the large intestine. 



(14) A transverse section through the caecum of the common goose. 

 A higher magnification of the lymphoid tissue contained in the wall of 

 the caecum of the common goose. 



(15) Rodentia — Mils niusculus, the house mouse. A longitudinal 

 section through the caecum of a mouse. To illustrate on the actual 

 specimen the various points mentioned in figure D. 



(16) Rodentia — Mus decumanus, the rat. A longitudinal section 

 through the wall of the apical portion of the caecum of a rat. To 

 illustrate the lymphoid tissue contained in that portion of the Avall of 



