upon Water containing a Salt of Magnesia. 



17: 



, 12°, 8°, 6°, 4°, 

 and so on up 



dered that I had standard solutions of 16 

 2° hardness of lime, plus 1°, 2°, 3° magnesi 

 to 1 6°. 



The Tables Nos. 2 to 7 give the number of soap-test mea- 

 sures which I have found requisite to produce a perfect and 

 renewable lather, when shaken with one hundred test mea- 

 sures of these solutions in a phial capable of containing about 

 five fluid ounces. 



Table No. 1. 



Table No. 2. 



Magnesi an 



Soap-test 



Soap-test 



Lime 





Magnesian 



Soap-test 



standard. 



measures. 

 Magnesia. 



measures. 

 Lime. 



standard 





standard. 



measures. 



o 



1 



3-2 



32 



o 



16 







+ 1 



31-6 



2 



5-4 



5-4 



16 



+ 2 



31-6 



3 



7'6 



76 



16 



+ 3 



315 



4 



9-5 



9-6 



16 



+ 4 



31-5 



5 



11-5 



11 6 



16 



+ 5 



31-4 



6 



13-4 



13-6 



16 



+ 6 



31-3 



7 



14-8 



156 



16 



-1- 7 



31-2 



8 



15-4 



179 



16 



+ 8 



310 



9 



160 



19-4 



16 



+ 9 



30-8 



10 



16-9 



213 



16 



+ io 



30-5 



11 



177 



23-1 



16 



+ 11 



302 



12 



183 



24-9 



16 



+ 12 



29-8 



13 



18-7 



26-7 



16 



+ 13 



29-4 



14 



19-1 



28-5 



16 



+ 14 



28-9 



15 



19-4 



30-3 



16 



+ 15 



28-4 



16 



19-6 



320 



16 



+ 16 



279 



Table No. 3. 



Table No. 4. 



Lime 





Magnesian 



Soap-test 



Lime 





Magnesian 



Soap -test 



standard 





standard. 



measures. 



standard 





standard. 



measures. 



12 



o 



+ 1 



24-6 



o 



8 







+ 1 



173 



12 



+ 2 



24-5 



8 



4- 2 



173 



12 



+ 3 



24-4 



8 



+ 3 



173 



12 



+ 4 



24-3 



8 



+ 4 



173 



12 



+ 5 



241 



8 



+ 5 



173 



12 



+ 6 



23-9 



8 



+ 6 



172 



12 



+ 7 



23-4 



8 



+ 7 



171 



12 



+ 8 



22-8 



8 



+ 8 



16-9 



12 



+ 9 



22-5 



8 



+ 9 



16-0 



12 



+ 10 



22-3 



8 



+ io 



15 



12 



+ 11 



221 



8 



+ 11 



14-6 



12 



+ 12 



220 



8 



+ 12 



14-5 



12 



+ 13 



21-9 



8 



+ 13 



144 



12 



+ 14 



21-8 



8 



+ 14 



143 



12 



+ 15 



21-7 



8 



+ 15 



142 



12 



+ 16 



217 



8 



+ 16 



14-1 



