610 CHRISTIAN CHAMPY AND H. M. CARLETON 
formation. D, ©, F, and G show its appearance in transverse section. 
Technique: Bouin and iron haematoxylin. 
Fig. 2.—Nuclei of smooth muscle from the intestine of the Axolotl. 
A and B are longitudinal sections of nuclei, while c is transverse. All 
show the spiral circular incisions in the nuclear membrane. Technique : 
carbol-formalin and iron haematoxylin. 
Fig. 3.—Cell from intestine of Oniscus. Note deformation of nucleus 
by * Tonofibrillae ’. 
Fig. 4.—Cell from Wolffian duct of Salamander showing the intra- 
nuclear canaliculus and centrosomes opposite its aperture. 
Fig. 5.—Intestinal epithelial cell from Libellula sp.—a dragon fly. 
Note that here the length of nucleus is not proportional to that of the cell. 
Fig. 6.—Nuclei in longitudinal and transverse section from heart of 
Helix pomatia (snail). Incisions in nuclear membrane. Technique : 
Flemming and iron haematoxylin. 
Fig. 7.—Hepatic cells of Salamander. At x the nucleolus is in 
contact with the nuclear membrane, which is slightly invaginated at this 
point. Technique: Bouin and iron haematoxylin. 
