1 38  Dr.  haygarth’s  Obfervations  on  the 
ference,  Stagnates  in  the  ditches  of  the  fuburbs,  viz.  the 
Headlands,  Barker’s-lane,  Horn-lane,  and  Greg’s-pit,  in 
John’s  parifh;  Fluckerfbrook  and  Cow-lane,  in  Ofwald’s 
parifh;  Nun’s-lane  and  garden,  Skinner’s-lane  and  Stye- 
lane,  in  Mary’s  parifh;  the  Sluices  and  the  Rood  Eye,  in 
Trinity  parifh.  There  is  not  one  inftance  of  Stagnant 
water  within  the  city  walls,  except  in  Nun’s-lane  and 
garden.  As  there  is  a fufficient  declivity  from  all  thefe 
ditches  into  the  river,  it  would  be  a very  eafy  and  molt 
falutary  improvement  to  drain  them  perfectly,  and  feems 
highly  to  deferve  the  attention  of  our  magistrates.  The 
ancients  were  particularly  attentive  to  fuch  regulations, 
as  appears  from  a letter  of  the  younger  Pliny  to  Trajan. 
Amajlrianorum  civitas , domine , et  elegans  et  ornata,  babet 
inter  pracipua  opera  pulcherrimam , eandemque  longijft - 
mam  plat  earn : cujus  a latere  per  Jpatium  omne  porrigitur 
nomine  quidem  jlumen , re  vero  cloaca  foedijjitna:  qua  Jicut 
turpis,  et  immundiffima  afpedlu,  it  a pejlilens  ejl  odore  te~ 
terrimo.  fpuibus  ex  caujis , non  minus  falubritatis  quam 
decor  is  inter  ejl  earn  contegi. 
By  the  induction  of  numerous  fadts,  two  princi- 
pal fources  of  continued  fevers  have  been  difcovered, 
that  is,  the  contagion  of  human  effluvia,  and  of  marfh 
miafmata:  the  latter  is  diftinguifhed  by  frequently 
afluming  an  intermittent  type,  or  changing  into  a dy- 
sentery.. It  may  be  doubted,  to  which  kind  of  pefti- 
lence 
