110 MUM-TIC VARIATION. [PARTI. 



i/.i From liiinli:ir towards dorsal type. 



!;. Tli.- formation of inoveable ribs upon vertebrae normally be- 



li.nv:iiiu r i" til-- luiiil)jir groups is in Man rarer than reduction of tin- 



liNi ill,- In thes,- i-ases the ribs may or may not coexist with 



processes of considerable size. In a case of 13th rib in 



M i ^iven by Struthers (/. c., p. 00), the change of articular pro- 



iin-d a space lower than usual, being thus correlated with 



tin- :tj.| arance of ribs at a lower point. 



3) \.\i> ( I- >. 1 1 inwusis between lumbar, sacral and coccyyeal 



vertebras. 



17. Tin- diH'ereiici s lietwct-n the vertebrae of these regions are far 



more matters <>t degree than those between the members of other 



ons. H\ '! tachment of the 1st sacral (2oth vertebra) 



tin- lumliais ma\ become (), and in thi- rase the 2nd sacral wholly 



or partially takes tin- characters proper ! the 1st sacral, but this 



change i- not neci asarilj accompanied by union between the last 



al and tin- l~i coccygeal <~'-e, for example, STRUTHERS, I.e., 



p. t;M. (>ii tin- other hand. th- last lumbar may unite with the 



I ial. and sui-h union may IK- rithrr symmetrical or unilateral 



onl\. 'rip- aiiioiint t which th<- ilium articulates with these ver- 



and tin- degree to which tln-ir jn-<.c,--Nes are developed to 



support it aUn ]>n--i-nt many -hadi-s of variation. Similarly the 



la-t -a-ral may IH- (>,,, i,r th,- |-i (,,,-, ygeal may be united to the 



tcrum. 



Since all tlirM- chaiiL:' s an- manifestly ijiiestions of degree it 

 v.onld he inteiv-ting tn know whetliej- any particular positions in 

 th' !' chan--e> are found nmi-e tiv|uently than others, but I 



know no liody of st.-ti i-t ic> iVoni which this might be determined. 

 In the alis. -nee ,,( -uch determination thei-e is no reason to suppose 

 the exist, nee of ]>i- ..... tiniiitv in thoe variations. 



H"M<i."|-|- VABIATION, \'J:I;TI:I;I;.K AND Hius. 

 1 1. .I/-/' ' '"in fiti i ' j.- Man. 



examples "I ihe occurrence "f llonnrosis lietween mem- 

 l"-i- ( ihe several re-ions we have now to pass to the more 

 interesting <\\\>^\ \\\ [ the degree to \\ hirti | loino-osis in one part 

 of the column ma\ l.e con-elated \\ith .similar llomo-oti.- \ariation 

 in the other parts. |-', , r though each of the part in i la r dian-es in 

 tin- \:iri..M- regions may occur withoul correlated change in other 



'h eonvlatioii nevertheless otteii occurs, and in am cmi- 

 >ideiaiioi, of magnitude .,1 \'aiiati..n it is a ta.-tor <,f importance. 

 In several !' the examples to ! -i\,-n it \\ill In- seen that the re- 

 di-tril.ution ot regions LS aU.. associated with Meristie change in 

 th. total iiMinln i pnents in the column. Et is obvious that in 



