STUDIES ON CILIATED CELLS 233 



only the efferent tubules of the reptihan and mammalian testis. 

 The cells with brush borders in these places, as will be afterwards 

 more particularly described, become converted into cihated. 

 In this transformation the ciha are produced, not by the lengthen- 

 ing of the hairs, but from an intracellular constituent, which 

 passes out through the axis of the hairs, so that there exists no 

 genetic relation between the two. I will return to this question 

 further on. 



3. The basal corpuscles. Historical. By the basal corpuscle 

 is meant a minute granular or rod-like body, situated at the 

 proximal end of each ciUum and stained black by iron-haema- 

 toxyhn. It would seem never to be lacking in the ciliated cell 

 proper; there is, however, no uniformity as to its shape and 

 position; it also varies considerably according to the degree of 

 coloration. 



A review of the literature shows that there is a considerable 

 difference of opinion as regards the shape, position and arrange- 

 ment of basal corpuscles, which is briefly summarized as follows : 



Shape: (a) spherical or elliptical granules (Lenhossek '98, 

 Studnicka '99, Wallengren '05, Erhard '10); (6) short rod-like 

 corpuscles (Studnicka '99, Ikeda '06); (c) dumb-bell-shaped or 

 diplosome-like granules (Gurwitsch '00, '01; Henry '00; Fuchs 

 '04; Kolacev '10; Tschassownikow '13). 



Position: the basal corpuscles are situated (a) in the distal 

 border of the ciliated cell destitute of the cuticle (Lenhossek '98) ; 

 (6) in the cuticle itself (Heidenhain '99, Gurwitsch '01;) (c) 

 underneath the cuticle (Apathy '97, Studnicka '99, Wallengren 

 '05, Erhard '10); (d) more or less deeply in the cytoplasm below 

 the cuticle, as in the ciliated cells in the tela of Petromyzon and 

 Salamandra (Studnicka '99). 



Arrangement of basal corpuscles; viewed from the surface: 

 they are either (a) irregularly scattered (Lenhossek '98); or (6) 

 gathered in the central part (Studnicka '00); or (c) arranged in 

 linear series (Engelmann '80, Gurwitsch '01); or (d) fused into 

 hues (Engelmann '80). 



Summary aiid discussion. It is worthy of remark, that the 

 result of staining with iron-haematoxyhn, which is usually applied 



JOURNAL OF MORPHOLOGY, VOL. 29, NO. 1 



