304 OSWALD g. LOWSLEY 



tid of Morgagni and some rudiments near the testes. Primrose 18 

 believes that the uterus masculinus must be looked upon as the 

 homologue of the series of structures formed in the female by the 

 fused portions of the Mullerian ducts. Minot 19 states that in 

 the male the Mullerian ducts remain rudimentary and their middle 

 portions usually abort leaving the upper fimbriated ends to 

 develop into so-called hydatids of Morgagni, and the lower or 

 caudal ends to unite within the genital cord to form the so-called 

 uterus masculinus, a rudimentary representation of the female 

 uterus and vagina. 



The prostates used in this investigation were obtained from 

 Dr. Mall's collection of human fetuses which were preserved in 

 alcohol or in formalin (4 per cent). They were imbedded in 

 paraffine and cut. in series, being stained with haematoxylin and 

 eosin or Mallory's stain. The measurements taken are crown- 

 rump, and the ages of embryos are estimated according to the 

 table in Keibel-MalPs Manual of Embryology. 20 



Before taking up the discussion of the various specimens it 

 seems best to state the terminology to be used. The various 

 parts of the prostate gland will be referred to as follows: (1) The 

 middle lobe, or that part of the gland which is situated between 

 the bladder and the ejaculatory ducts under the floor of the ure- 

 thra (prespermatic and post urethral). (2) Lateral lobes, or 

 those parts of the gland which arise from the prostatic furrows 

 and the lateral walls of the urethra and extend laterally and pos- 

 teriorly from that structure. (3) Posterior lobe, or that part of 

 the prostate which lies dorsal to the ejaculatory ducts above their 

 entrance into the urethra and dorsal to the urethra below this 

 point (post spermatic and post urethral). This is the part of 

 the prostate which is felt per rectum. (4) Ventral lobe, or that 

 part of the organ formed by glands arising from the anterior or 

 ventral wall of the prostatic urethra. 



18 Primrose, Jour, of Anatomy and Physiology, 1899, p. 64. 



19 Minot, Human embryology, New York, p. 490. 



20 Keibel-Mall, Human embryology, Philadelphia, vol. 1, 1910, pp. 180-200. 



