( ;i5o ) 



TIk; lalcral paii df lli(> ('(Mili'.-il awiu movo (liHiciili lo l.c iviidei-od 

 because of i(s u-i-cai \ arialulilv of form, may he ivprcseiitcd, in (•as(>s 

 very favorable lo isolalioii. \)y a iiearlv licxa.uoiial li.üiirc (see li,u'. 

 1, 5). Ill verv iiiifavorahle cases i| camioi !>(> shown at all. In sneh 

 eases the central area a|)|)eai-s lo he intei-i-npled. between both 

 exli-emes other cases niav be observed, in which the lateral ceiilral 

 ai-ea has been onlv partly preserved. 



An instance niav be forwarded bv tlK> followinu' observation: 

 ^^ 1. On a .strong male dog the IGfli (lermatoiua is isolated in tlie usual manner. 

 The day after tJie operation a central area is determined, Llie extension of which 

 is represented in fig. ± Possessing a broad basis at the mid-dorsal line, it ends 

 in a point towards flic mid-ventral line. 



Fig. '2. A contitiuous c<'ntr;il urea, extiMiding itsrlf IVnm tlie 

 111. d. I. to ttic 111. V. I. 

 After two days, [liis area has fallen asiindei- info three jiaits, viz. a Iriaiigiilar 

 area towards the mid-dorsal line, a rliomboidal area towards tli(> mid-ventral line 

 (see fig. 'j, i^iid a circular area situated between the former two (sec fig. 3), 



Fig. ;i. After two day.s, this area lias fallen asunder 

 into three parts. 



