360 A. E. Foote—Jagn Vacuum or Filter Pump. 
Meteorie Iron of Grau Chaco. 
The government of the Argentine province of Santiago del 
Kstero has offered a liberal premium for the discovery of the mass 
of meteoric iron so often cited as existing within that province 
in the uninhabited region known as the Grau Chaco. This ma 
of iron, cited in almost all the books, was described in 1788 
by two engineers, Celis and Cervino, who had been sent by the 
source for the manufacture of fire-arms. : 
The expedition was successful, and returned with a consider- 
able quantity : a pieve weighing about 1,500 Ibs. was given to 
Sir Woodbine Parish, the English Consul, who described it im 
his well known work on the La Plata, and sent it to the British 
Museum. The English chemists found it to contain about ten 
per cent of nickel. A brace of pistols manufactured from the 
same material was sent to the President of the United States. 
Similar but smaller pieces of iron are said by the Indians to 
exist in abundance in the same region, and it is to be hoped 
that under the stimulus of the large pecuniary reward now 
offered, the long lost site may be discovered anew. 
— 
Arr. XXXIX.—On a Modification of the Jagn Vacuum or Filter 
Pump ; by Prof, A. E. Foore. 
