96 
Not one dispenser lias succeeded in making the prescrip- 
tion to the exact strength in either the mixture or lotion. 
In the potassium iodide mixture, five out of the eighty- 
one dispensers have come within the range of J a grain 
more or less than the prescribed amount ; forty have made 
the strength of the mixture within 5 grains more or less 
than the prescribed amount ; whilst tlm remaining forty-one 
have made greater errors. 
In the zinc sulphate lotion fourteen out of the eighty- 
one dispensers have come within the range of J a grain 
more or less than the prescribed amount; forty-five have 
made the strength of the lotion within 2 grains more or 
less than the prescribed amount ; whilst the remaining 
thirty-six have made greater errors. 
It may be interesting, before leaving this part of the 
subject, to make a few further observations on the dis- 
pensing of these solutions. We found that the mixture of 
No. 74, dispensed by a man in Birmingham, was strongly 
alkaline to test paper, and I submitted its contents to 
further analysis and found, that out of the 115'7 grains 
represented in the table, lOO'l was composed of carbonate 
of potash, and 15 *6 of iodide of potassium, etc. From 
this large proportion, it seems as if the former salt had been 
intentionally added, along with a small proportion of potas- 
sium iodide. One (No. 48) from Eccles contained 2 -5 grains 
of Potassium Carbonate in the 126 '7 grains weighed out. 
Many were absolutely free from Potassium Carbonate and 
many contained traces of that salt. No. 46 had both the mix- 
ture and lotion corked with very dirty corks. The dispenser 
of No. 16 (from Edinburgh) put in a preparation of orange 
