202  Influence  of  Pharmacists  on  Chemistry.  \mrm' 
1 812,  and  shortly  thereafter  Wetherill  &  Bros,  also  began  the 
manufacture  of  sulphuric  acid  on  the  east  bank  of  the  Schuylkill 
River.  Chas.  Lennig,  the  founder  of  the  present  firm  of  Chas. 
Lennig  &  Co.,  Inc.,  also  began  the  manufacture  of  sulphuric  acid  in 
1829,  Rosengarten  &  Sons  shortly  thereafter,  and  Carter  &  Scatter- 
good  in  1834,  also  were  early  manufacturers  of  sulphuric  acid. 
Nitric  acid,  under  the  name  of  aqua  fortis,  is  mentioned  in 
Scharf  &  Westcott's  "History  of  Philadelphia"  as  made  by  Christo- 
pher Marshall,  Jr.,  a  Philadelphia  druggist,  at  the  close  of  the  last 
century.  A  communication  from  Mr,  Thos.  Skelton  Harrison  says 
his  grandfather,  John  Harrison,  began  to  make  both  nitric  and 
muriatic  acids  in  1804.  Carter  &  Scattergood  had  it  on  their  list 
of  manufactures  in  1834.  Muriatic  acid  is  also  mentioned  as 
made  by  this  latter  firm  in  the  year  1834,  as  were  tartaric  acid  and 
citric  acid. 
Manufacture  of  Paint  Colors. 
The  first  white  lead  factory  of  Samuel  Wetherill  &  Sons  was 
built  in  1804  at  the  corner  of  Broad  and  Chestnut  Streets,  but  it 
was  burned  down  a  few  years  later,  and  in  1808,  they  erected  a 
new  factory  at  Twelfth  and  Cherry  Streets. 
"His  son,  Samuel  Wetherill,  Jr.,  was  the  active  man  of  the 
concern,  and  assisted  his  father  in  all  business  matters.  The  en- 
forced experience  which  was  pressed  upon  them  during  the  revolu- 
tion, concentrated  their  attention  upon  the  manufacture  and  sale 
of  chemicals,  and  they  went  into  the  drug  business.  In  1785, 
Samuel  Wetherill  &  Son  were  located  in  Front  Street,  above  Arch. 
Here,  for  many  years,  'WetherilFs  Drug  Store'  was  an  old  land- 
mark, and  the  place  at  which  sons  and  grandsons  were  brought  up 
to  the  business.  The  Wetherills  were  the  pioneers  in  the  manu- 
facture of  white  lead.  They  established  it  before  the  year  1790. 
They  erected  extensive  white  lead  works  near  Twelfth  and  Cherry 
Streets,  which  were  burnt  down  in  1813,  but  afterwards  rebuilt. 
"The  fire  which  destroyed  the  white  lead  works  proved  to  be 
incendiary  and  started  by  a  young  English  officer  the  day  before 
he  sailed  for  England. 
"In  October,  181 1,  Samuel  Wetherill,  Jr.,  obtained  patents  for 
a  new  mode  of  washing  white  lead  and  for  screening  and  separat- 
ing metallic  from  corroded  lead  in  the  process  of  making  red  lead, 
and  using  the  first  machine  ever  used  for  manufacturing  purposes 
