Mb. Wilson on Experiments with different Manures. 



51 



regretted, however, that the results of Robiquet's process are bj no 

 means uniform; ono time it yields a good deal of Ultramarine of 

 excellent quality, and perhaps, at the very next repetition of the process 

 in circumstances apparently similar, very little Ultramarine is obtained, 

 and that of an inferior quality. 



The fabrication of Ultramarine is a subject which well deserves the 

 attention of English chemical manufacturers, as it could be carried on 

 with peculiar advantage in this country. The chief expense of the 

 process is the fuel required, which can be purchased in Great Britain 

 for less than half the money it would cost either in France or Ger- 

 many. 



Mr. More read a Notice on Galvanometers, as Measurers of Electric 

 Currents. 



6th April, 1842, — The President in the Chair. 



Dr. Hutcheson was admitted a Member. 



On the motion of Mr. Liddell, it was resolved, that the printed Pro- 

 ceedings of the Society should, this session, be presented gratuitously 

 to the members, and that in subsequent years the library subscrip- 

 tion should be increased from 12s. 6d. to 15s. in order to meet the ex- 

 pense of publication. It was farther agreed, that the original and 

 non-resident members should contribute 5s. each, per annum ; and, in 

 consideration of these increased contributions, each member should 

 be entitled to a copy of the transactions when published. 



The following communication was read: — 



XVII. — Comparative Experiments made with different Manures. 

 By John Wilson, Esq. 



A PIECE of three years' old pasture, of uniform quality, extending 

 to two hundred falls, old Scotch measure, was divided into ten lots, of 

 twenty falls each. These were treated as follows, and produced, res- 

 pectively, the quantity of well-made hay placed opposite each of the 

 lots in the table. 



