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A DESCRIPTION of an AIR-PUMP of a NEW 

 CONSTRUCTION, with an ACCOUNT of its 

 PERFORMANCE, and of fome EXPERIMENTS and 

 OBSERVATIONS tending to afcertain the CIRCUM- 

 STANCES on which the PERFECTION of that 

 MACHINE depends, attd to render its THEORY more 

 compleat: By the Rev. JAMES LITTLE of Laeken 

 in the County of Mayo. 



Ike many difcoveries which have done honour to the exer- Read Dec. 

 tions of the eledricians and chemifts, even fince the middle of '7''' '796- 

 this century, encourage us to hope that their labours will not 

 terminate 'till they become the means of affording to pofterity 

 a more extcnfive knowledge of the latent principles and powers 

 of nature, and confequently a more devout convidion of the 

 wifdom of its great Creator, than there was any profped of in 

 the preceding age. Such knowledge of the works of God, fought 

 out of all them that have pleafure therein, and affording unex- 

 pedcd advantages to human life, is the rcfult of experimental 

 enquiry ; and experiments cannot be made without proper inftru- 



ments 



