﻿392 Bibliography. 



the oxide of iron and reprecipitating this even to the eighth time. 

 Adopting this method, the precipitated oxide of iron was redis- 

 solved six times and the proportions obtained were as follows: 



Iron, 



Nickel, 



94-224 

 6-353 



100-577 



The sulphurets were examined also for the presence of tin, 

 cobalt, copper, lead, arsenic, &c., bat without success. They 

 seemed to be only simple compounds of iron and sulphur. The 

 specific gravity of the iron was 7-5257. 



To determine more satisfactorily the presence or absence of 

 chlorine, a piece of the iron (about one pound weight) was ex- 

 posed in a humid atmosphere on a capsule under a bell glass for 

 many days, and the little drops of water which trickled down 

 and were caught by the capsule, were tested for chlorine with 

 (as before) only a very feeble indication with nitrate of silver. 

 My friend and pupil, Mr. D. Olmsted, Jr., made the analysis un- 

 der my particular direction. 



I have not had an opportunity to repeat on this specimen the 



number of this Journal, p. 149. 



Yale College Laboratory, Jan. 28, 1845. 



Mr 



Art. XVII. — Bibliographical Notices. 



1. Report of the Commissioner of Patents for 1844 ; by the Hon. 

 H. L. Ellsworth. 8vo, pp. 520. — This report, like that which has 

 preceded it from the same distinguished source, contains a great fund 

 of information on subjects connected with Agriculture and the Arts, and 

 their progress in our country. We quote from it the following account 

 of a new magneto-electric machine by Prof. C. G. Page. 



1838 



form 



w T ith many existing objections, and furthermore rendering it at once a 

 useful instrument, by a contrivance for conducting these opposing cur- 

 rents into one channel or direction, which part of the contrivance was 

 called the unitress. The current produced in this way was capable of 

 performing the work, to a certain extent, of the power developed by the 



galvanic battery : and the mn<».hinft was fmind nnWiiiatA tn furnishing 



