250 
Druggist  and  Veterinarian. 
Am.  Jour.  Pbarm. 
June,  1915. 
tion  of  the  method.  A  period  of  15  minutes  after  the  addition  of 
the  reagent  (formaldehyde  sulphuric  acid)  was  allowed  in  each  of 
the  following  cases  before  a  note  of  color  produced  was  made: 
1/200  grain  of  heroin:  slight  coloration  produced. 
1/100  grain  of  heroin:  light  reddish-yellow  color  produced. 
1/50    grain  of  heroin:  red-yellow  color  produced. 
1/45    grain  of  heroin:  deeper  than  1/50  of  a  grain. 
1/40    grain  of  heroin:  deeper  than  1/45  of  a  grain. 
1/30    grain  of  heroin:  much  deeper  than  1/40  of  a  grain. 
1/20    grain  of  heroin:  very  much  deeper  than  1/30  of  a  grain. 
1/10    grain  of  heroin:  cherry-red  color  produced. 
1/5     grain  of  heroin:  deep  cherry-red  color  produced. 
I  have  found  that  a  difference  of  1/450  of  a  grain  of  heroin  will 
produce  an  appreciable  change  in  color  when  1/50  of  a  grain  is 
used,  and  that  a  difference  of  1/100  of  a  grain  of  heroin  will 
produce  a  very  perceptible  change  in  color  when  1/20  of  a  grain  of 
heroin  is  used. 
I  prepare  these  standards  by  making  up  several  solutions  of 
heroin  in  one  per  cent,  sulphuric  acid  solution,  and  then  pipetting 
by  means  of  a  pipette  graduated  in  1/100  Cc. 
One  solution  is  prepared  containing  1/5  grain  of  heroin  per  Cc. 
Another  solution  is  prepared  containing  1/10  grain  of  heroin  per 
Cc.  A  third  is  prepared  containing  1/20  grain  of  heroin  per  Cc. 
A  fourth  solution  is  prepared  containing  1/40  grain  of  heroin  per  Cc. 
Chemical  Laboratory.  Department  of  Health, 
New  York  City. 
RELATION  BETWEEN  DRUGGIST  AND  VETERINARIAN.1 
By  T.  B.  Rogers,  D.V.S.,  Woodbury,  N.  J., 
Veterinarian,  Scientific  Department,  H.  K.  Mulford  Company. 
There  are  few  things  more  impressive  to  one  who,  like  myself, 
has  passed  the  meridian  of  life  than  to  stand  before  a  class  of  young 
men  in  a  great  institution  of  learning  and  contrast  their  virile,  though 
fleeting,  youth  with  their  venerable  Alma  Mater.  For,  while  the 
students  and  alumni  of  your  institution,  from  the  irrepressible  fresh- 
1  Special  lecture  delivered  at  the  Philadelphia  College  of  Pharmacy, 
March,  1915. 
