54 Prof. T. E. Thorpo on the History of the 



17. Determination of total Sulphur. — A known quantity 

 of the water was mixed with bromine immediately after being 

 taken from the spring. After standing the barium sulphate 

 formed was filtered off and weighed. 



Water taken. BaSO t obtained. S in 1000 grams. 



1028-69 grams. 0*1078 gram. 0*0144 



1037-05 „ 0-1070 „ 0-0142 



Mean ... 0-0143 



Barium chloride was added to the filtrates. 



Water taken. BaS0 4 obtained. S in 1000 grams. 



1028-69 grams. 0-5834 gram. 0'0780 



1037-05 „ 0-5884 „ Q-Q780 



Mean ... 0'0780 

 Total sulphur = 0'0923 



18. Determination of Sulphur oxidizable by Iodine solution. 

 — -These determinations were made at the well in the usual 

 manner, with standard iodine solution and starch (1 cub. centim. 

 of the iodine solution contained 0*00118 gram I). 



Water taken. Iodine solution needed. 

 50*50 grams. 31-5 cub. centims. 

 50-50 „ 31-4 „ 



50*50 „ 31-1 „ In 1000 grams. 



50-50 „ 31-5 „ Mean 31*4 cub. cent. = -0923 S. 



It is evident, from the absolute agreement between the results 

 of the two independent methods of determining the sulphur, 

 that no thiosulphate can be present. 



19. Determination of the Sulphur as Hydrogen Sulphide, and 

 as Alkaline Sulphide. — A considerable amount of discussion has 

 occurred respecting the manner in which the sulphur, perhaps 

 the chief remedial agent in the water, is contained in it. It 

 would seem to be certain from the above determinations that 

 it exists entirely as a sulphide, either as hydrogen or alkaline 

 sulphide, or more probably in both forms. Dr. Bennett, in 

 his ' Treatise on the Sulphureous Springs of Harrogate,' pub- 

 lished in 1843, states that no free sulphuretted hydrogen is 

 present in this water, but that all the sulphur exists in com- 

 bination with calcium and sodium ; and in all the analyses 

 which have been made subsequent to that time the sulphur 

 has been calculated to sodium sulphide or sulphydrate. Dr. 

 Bennett based his conclusions on the observations that no 

 arsenic sulphide was precipitated on the addition of a solution 

 of arsenious oxide to the water. This test, however, is falla- 

 cious, inasmuch as any arsenic sulphide which might be formed 



