Dr. Schafhaeult on Cast L-on, Steel, and Malleable Iron. 427 



The acid had scarcely been poured over the iron (B), when 

 the whole powdered iron rose, under a rather violent evolution 

 of gas, to the top of the acid. A short time after the acid be- 

 came of a yellow colour, and the caseoid or cheese-like whitish 

 foam increased each moment on the top of the acid during 

 the evolution of hydrogen, and filling almost the whole of the 

 upper part of the retort. 



In Woulfe's bottles distinct glittering scales of sulphuret of 

 lead were rapidly deposited ; the gas escaping out of the last 

 bottle had, in an extremely slight degree, in smell the character 

 of hydrogen developed by means of acids from iron, but no 

 longer affected a solution of nitrate or acetate of lead. The 

 liquid was found next day opake, of a light gray colour, 

 still developing gas. 



The evolution from iron (A) had ceased long before. The 

 iron (A) or white Welsh iron formed likewise a caseoid or 

 cheese-like substance on the top of the acid, but its colour 

 was dark gray approaching to black, and the liquid below was 

 also of an opake dark gray. 



The sulphuret of lead formed in the Woulfe's bottle was 

 not scaly, like that from the gray iron, but resembling a dark- 

 brown greasy viscid mass, making the whole liquid turbid, and 

 only settling two days afterwards. The mass in the retort 

 was then dark gray, with a somewhat lighter sediment. 



The residuum in the retort of the gray French iron (B) 

 cast upon a filter, washed without interruption with boiling 

 hot distilled water, was of a soap-like greasy form, and had 

 after being dried a grayish-white flowery appearance. As 

 often as I poured fresh water on the filter, the already col- 

 lapsed mass began to swell like a sponge, and almost filled the 

 whole filter. This residuum, dried at a temperature of 212° 

 Fahr., weighed 5*53 grains, and had an extremely light ap- 

 pearance resembling silica, chemically separated from mi- 

 nerals. 



On 2"1 grains of powder were poured in a test-tube 5 

 drachms of concentrated caustic ammonia., the test-tube shut 

 with a perforated cork, which contained as usual an S-like 

 bent glass tube; a violent evolution of gas in extremely 

 minute bubbles took place, which ceased only twenty-four 

 hours afterwards. The powder lay on the bottom of the test 

 tube in lenticular aggregates of a gray colour; the evolved 

 gas collected over water measured at 65° Fahr. and 29*35 

 height of barometer, 0*605 cubic inches, corrected for water 

 0"586 cubic inches. It was, except small traces of oxygen 

 and azote from the remaining air in the test tube, pure hydrO" 

 gen. 



2 F2 



