288 Fungicidal Properties of Certain Sprat/ -fluids 



solution^ it was found that (S) and (NH4) were present in the necessary 

 proportions to form (NH4)2S. In one litre of this solution, 12 grms. of 

 flowers-of-sulphur were dissolved, giving a pale yellow liquid referred 

 to as Stock Solution No. V. 



Solution VI. To 300 c.c. of the solution of (NH4)2S referred to in 

 the preparation of Solution V, 30 grms. of flowers-of-sulphur were 

 added and the liquid kept in a warm place for some time. After about 

 24 hours the clear, red liquid was decanted from the excess of sulphur, 

 and it formed the stock solution. This stock solution did not allow of 

 being diluted with water without depositing large quantities of sulphur, 

 nor could it be kept for long unchanged. 



Soluliou VII. A current of sulphuretted hydrogen gas was passed 

 through a litre of aqueous ammonia (sp. gr. 0-987 at 15° C.) until the 

 solution was practically saturated. The solution was then mixed with 

 a litre of aqueous ammonia of the same sp. gr. as that used in the first 

 instance. To this mixture 200 grms. of flowers-of-sulphur were added 

 and a further quantity of hydi'ogen sulphide gas passed through the 

 liquid until the clear liquid had sp. gr. 1-034 at 15° C. This clear liquid 

 formed the Stock Solution No. VII. 



Solution VIII. To 400 c.c. of strong aqueous ammonia (.sp. gr. 0-8(S0) 

 an equal volume of distilled water was added and whilst a currei}t of 

 sulphuretted hydrogen gas was passing through the liquid, flowers-of- 

 sulphur were added in excess from time to time. After several hours, 

 when no more sulf)hur would dissolve and the temperature of the liquid 

 decreased, the deep red clear liquor which resulted was decanted from 

 the undissolved sulphur into a stoppered vessel. After standing for 

 several days, this decanted liquid deposited crystals which on analysis 

 were found to contain 18-33 % NH4 and 81-2 % S, therefore agreeing 

 with the composition (NH4)2S5. To a weighed quantity (8-2354 grms.) 

 of these crystals in a stoppered bottle, cold recently boiled water was 

 added, resulting in the deposition of sulphur and the formation of a 

 golden yellow solution. The water was run in until the addition of a small 

 quantity produced no further precipitation of sulphur, the volume of 

 water necessary in this case being 200 c.c. After remaining for two days 

 in the closed vessel, the golden yellow solution was separated from the 

 dejjosited sulphur and this formed the Stock Solution No. VIII. 



Solution IX. This solution was prepared in the same way as 

 Solution VIII, i.e. by decomposing crystals of (NH4)2S5 by adding water 



' The method used was that given by Bloxam. Vide Trans. Chem. Soc, 1895, 

 p. 289. 



