4<X> HISTOLOGY 



tions may often be obtained in this way. Mayer's muci-carmine is a 

 good stain for this purpose. Delafield's haematoxylin is perhaps the 

 best. 



LITERATURE 



HAMMARSTEN, O. "Studien iiber Mucin und mucinahnliche Substanzen," Arch. f. d. 



ges. Physiol., 1885, Band XLVI, S. 373. 

 NOLL, A. " Das Verhalten der Driisengranula bei der Sekretion der Schleimzelle und del 



Bedeutung der Giannuzzi'schen Halbmonde," Arch. f. Physiol., 1902, Suppl. Band, 



S. 166. 

 HAIDENHAIN, M. "Uber die Struktur der Darmepithelzellen," Arch. f. mik. Anal., 



1899, Band LIV, S. 184. 

 HAGEN-TORN, OSCAR. "Entwicklung und Bau der Synovialmembranen," Arch. f. mik. 



Anat., Band XXI, 1882. 

 LOWENTHAL, N. "Zur Kenntnis der Glandula infraorbitalis einiger Saugetiere," Anat. 



Anz., 1895, Band X, S. 123. 

 PFITSNER, W. "Das Epithel der Conjunctiva," Zeitschr. f. Biol., 1897, N. F., Band 



XVI, 397 . 

 PIERSOL, G. A. "Beitrage zur Histologie der Harder'schen Drlisen der Amphibien," 



Arch.f. mik. Anat., 1887, Band XXIX, S. 594. 

 GURWITSCH, A. "Die Vorstufen der Flimmerzellen und ihre Beziehungen zu Schleim- 



zellen," Anat. Anz., 1901, Band XIX, S. 44. 



TISSUES FOR PRODUCING ATTRACTIVE AND OFFENSIVE ODORS 



In the mammals, and even in the Sauropsida, there are glands of the 

 sebaceous type that are developed and specialized to perform other func- 

 tions than lubrication. The anal glands of the Camivora are sebaceous 

 glands, concentrated in number and developed in size. Associated 

 with them are groups of saccular glands developed from the basal 

 layer of the stratified epithelium. These glands are not very well 

 adapted for lubrication purposes, and the fact that they are more or 

 less odorous would lead one to believe that they served some end in 

 the life and habits of the animal by giving off a distinctive scent. This 

 idea is supported by a provable fact when we encounter these same 

 glands in two of the mammals, the muskrat and the skunk. Here can 

 be recognized, in structure, the anal glands of the other mammals, enor- 

 mously enlarged, and producing a secretion that in the one case may 

 be considered attractive and in the other is very offensive. 



In section, these glands present but slight differences to the eye from 

 the common sebaceous glands of the hair in the other mammals. 

 They are somewhat larger, with larger cells and clearer cytoplasm, and 

 are placed on special primary invaginations of the integument on each 

 side of the anus. The saccular glands with simple secreting epithe- 

 lium are placed in groups that surround the glands of the sebaceous 

 type, They thus are collected into a single mass, the scent glands 



