THE SEXUAL ORGANS. 245 



the vasa efferentia, into which he introduced a fine canula. 

 For microscopical investigation, Gerlach recommends a solution 

 of gelatine, with carmine or chromate of lead. The vas deferens 

 is best studied in transverse sections, after it has been hardened 

 or dried, as are also the prostatic glands; whilst the muscles 

 of the prostate and the corpora cavernosa can be distinctly made 

 out only in the recent state, or after the application of nitric 

 acid. The helicine arteries may be seen, even in fresh prepa- 

 rations, close to the larger arterial trunks, but still better after 

 injection with fine materials.] 



Literature. — A. Cooper, ' Obs. on the structure and diseases 

 of the testis/ London, 1830, with twenty-four plates; E. A. 

 Lauth, ' Mem. sur le testicule humain/ in ' Mem. de la 

 societe d'histoire naturelle de Strasbourg/ torn. I, 1833; 

 C. Krause, 'Verm. Beobachtungen' (various observations), in 

 Mull. 'Arch./ 1837, p. 20; E. H. Weber, 'De arteri& 

 spermatica deferente, de vesica prostatica et vesiculis semi- 

 nalibus/ Progr., 1836, editum in Progr. collecta, II, 1851, 

 p. 178 ; ' Zusatze zur Lehre vom Bau und den Verrichtungen 

 der Geschlechtsorgane' (Contributions to the knowledge of the 

 structure and functions of the sexual organs), Leipsic, 1846 ; 

 C. J. Lampferhoff, ' De vesicularum seminalium natural et 

 usu/ Berol., 1835 ; Kolliker, ' Ueber die glatten Muskeln der 

 Harn- und Geschlechtsorgane/ in ' Beitrage zur Kenntniss der 

 glatten Muskeln' (On the smooth muscles of the urinary and 

 genital Organs, (in Contributions to the knowledge of the 

 smooth muscles), in ' Zeitsch. f. wiss. Zoologie/ I ; Fr. Leydig, 

 ' Zur Anatomie der m'annlichen Geschlechtsorgane und Anal- 

 driisen der Saugethiere' (On the Anatomy of the male sexual 

 Organs and anal glands of the Mammalia), in ' Zeits. f. wiss. 

 Zoologie/ II; A. v. Leeuwenhoek, 'Arcana Naturae/ p. 59; 

 Prevost and Dumas, 'Ann. d. Sc. Nat./ Ill, 1824, and 'Mem. 

 de la Soc. d'Hist. Nat. de Geneve/ torn. I, p. 180; B,. Wagner, 

 'Die Genesis der Samenthierchen' (The genesis of the Sperma- 

 tozoa), in Mull. 'Archiv/ 1836, and ' Fragmente zur Physio- 

 logic der Zeugung' (Fragments on the physiology of Genera- 

 tion), Munich, 1836; A. Donne, 'Nouv. Exper. sur les 

 animalcules spermatiques/ Paris, 1837, and ' Cours de Micro- 

 scopie/ Paris, 1844 ; A. Kolliker, ' Beitrage zur Kenntniss der 

 Geschlechtsverhaltnisse und der Samenfliissigkeit wirbelloser 



