5 2 
BIRD-FLTING. 
come, and make fubfervient the forces of the air, only to 
be conceived of in the previfion of an Infinite Mind, and 
only pofiible to the fupervifing and all-governing intelli¬ 
gence of a Great Firft Caufe. Surely if an undevout 
aftronomer is mad, he is ftill madder, who, with God’s 
marvellous creations all around him can fail to fee, or 
feeing, can deny the Exiftence and the Perfonality of God ! 
In this force-atmofphere velocity is equivalent to 
denfity, and hands for it. It is the force of the air- 
current, whether caufed by the wings of the flying crea¬ 
ture, or exifting naturally in the force-atmofphere, that 
gives the refiftance of flotation and the refinance of 
locomotion. 
On land the refiftance, which is fupport, is at the 
fame time, the fulcrum of locomotion ; both functions in 
folids being a co-exifting unit. 
But in fluids, where the fupport or flotation refults 
from difplacement, the refiftance which conftitutes flota¬ 
tion precedes, in fequential order, the refiftance which 
conftitutes the fulcrum of locomotion. The fulcrums 
are, therefore, two ; a fulcrum of fupport or flotation, and 
a fulcrum of propulfion or locomotion. 
But for the forces of the atmofphere, hydrogen fhips 
might float and be propelled in it equally as well as fhips 
are on the ocean. A balloon made in the fhape of a fifh 
fhould float perfetftly in ftill air, and admit of propulfion 
in fuch an atmofphere as fhips do in water. Whales are 
