53 



Darstellung des sogeiiaiiiiten „Diininutionsvcn'ganges", bei dem die Aus- 

 stoßung des Chromatins aus den theloiden Kernen und deren Auf- 

 lösung im Zellplasma keineswegs die Hauptsache, sondern lediglich 

 nur eine Begleiterscheinung (und Vorbedingung) der Neuentstehung 

 von Ersatzkernen (Epikarien) ist. 



Nachdruck verboten. 



Note on Unilateral Renal Aplasia. 



By T. WiNGATE ToDD, M.B., F.R.C.S., 



Professor of Anatomy, Western Reserve Med. Coll., Cleveland. Ohio, U.S.A. 



With one Figure. 



The obscurity which still hangs around the development of the 

 urogenital organs, in spite of many recent important researches into 

 that subject, makes any observation of value if it has some bearing 

 on the elucidation of so difficult a problem. In this connection there- 

 fore the following note has been written. The case occurred in Dr. 

 Craven Moore's clinic in Manchester. The patient, a male aged 28, 

 was healthy until he incurred an extensive superficial burn which be- 

 came septic and was followed by acute nephritis. After a partial 

 recovery, symptoms of uraemia developed and the patient died sud- 

 denly. At the post mortem examination the right kidney was found 

 to be much larger than normal and presented a slightly lobulated 

 appearance. 



The right supra-renal gland, and ureter were normal. On the 

 left side, however, beneath a normal supra-renal was a distinct mass 

 of what seemed to be con- 

 nective tissue, embedded in 

 the retroperitoneal fat 

 which normally surrounds 

 the kidney. The left ureter 

 was represented by a patent 

 portion opening into the 

 bladder, but its distal half 

 connected with the mass ,. Microphotograph of section from the mass of 



tissue representing the Jett kidney, bhowing renal 

 of tissue just mentioned, tubules embedded in connective tissue. 



consisted of an impervious 



fibrous cord which was only found after careful search. The genital 



organs and the rest of the urinary tract were normal. Histologi- 



