300 OSWALD S. LOWSLEY 



Griffiths 3 states in another paper that there can be no enlargement 

 of the third lobe unless there were gland tubules originally there. 

 Any one of the lobes may enlarge without involvement of the others. 

 This author states that enlargement does not take place in that 

 part of the prostate behind the urethra and anterior to the verum 

 montanum (posterior lobe). 



Mansell Moullin 4 states that the prostate is not an urinary 

 organ but that the point of origin of the prostatic glands has 

 simply been displaced in the course of racial development from 

 the lining of the Wolffian ducts to that structure, into which they 

 open. The question of the median lobe, according to this author, 

 depends upon the extent to which this displacement has occurred 

 in each individual. So long as the glands are restricted to the 

 prostatic sinus there is no medium portion. In some instances a 

 greater or smaller number are displaced towards the bladder and 

 they not infrequently occupy the middle line. Usually they remain 

 on the posterior wall of the urethra and form a more or less con- 

 spicuous median lobe. Exceptionally they make their appearance 

 upon the anterior wall as well. 



Keibel 5 does not agree with this opinion and considers the pros- 

 tate to be an urinary organ because its glands arise from the ure- 

 thra above the openings of the Wolffian and Miillerian ducts. 



Evatt 6 in a study of a 12 cm. (crown-heel measurement) foetus 

 which he considered to be three and one-half months of age, by 

 means of a wax model described the middle lobe to be made up of 

 branches of the two largest prostatic ducts which come together 

 in the midline behind and these, with two smaller ducts immedi- 

 ately above them, form a centrally placed lobe above the level of 

 the point of entrance of the genital cord. This he considers to 

 be the middle lobe and consists of ducts derived from both sides 

 of the prostate and cannot therefore be regarded as an azygos 

 structure. 



3 Griffiths, Jour, of Anatomy and Phy iology, London, vol. 24, p. 236, 1890. 



4 Mansell Moullin, Jour, of Anatomy and Physiology, vol. 29, 1895. 

 6 Keibel, Archiv fur Anatomic und Physiologie, 1896. 



6 Evatt, Jour, of Anatomy and Physiology, vol. 43, p. 314, 1908. 



