J. D. Whelpley on Philosophical Induction. 33 
I am aware that my results as to the peas and almonds differ 
somewhat from most previous analyses; but so much was 
taken in their purification, and so many concurrent determinations 
were obtained, both in analyses of the same, and of different pre- 
parations, that I feel much confidence as to ‘their correctness. [I 
leave the subject for the present with the hope, that my labors 
may in one direction throw a little light upon one of the most 
warmly contested questions of the present day, may open the 
way to some future enquirer who shall have the great happiness 
of definitely answering many of these long vexed questions. 
Arr. IV.—Letter on Philosophical Induction ; by James D. 
Wuetptey. (Addressed to one of the Editors of the J sie ) 
© .&...*. J wish.to. throw outa few thoughts regarding the 
true method, or what seems to me the true method to be — 
in the scientific study of nature, material and organic—the 
mean, of induction by analoc ry, (shall it be ealled ? ?) as 
Seinen from pipatiess % 
ogy is between the mass of the crystal and the single mole- 
oe: the induction is from the known to the unknown. 
Another species of the same induction, identifies a substance by 
its properties ; as, from the chemical evidences of chlorine, to infer 
presence e of chlorine. 
Nor is it easy to confound either of these with a third kind, 
the induction from antecedent to consequent—as when, from the 
marks of fire on a body, I infer that fire has passed over it, or 
when. from the elastic rebound of a ball, [ infer the cause to 
in a force accumulated in the ball. 
In all these instances, there is an induction gies the known 
to the unknown. As, from the properties of chlorin : 
stance chlorine ; from. the bound of the ball, to ie elastic force 
of t ang from the form of the whole crystal, to the form of its 
lolecules ; which may be expressed thus 
Induction: 1. From ae nip mein fi to colnaowe substance. 
ie 2. From known errecr to unknown cause. 
3. From known suare to unknown form 
_It seems to me impossible, by any effort of logic, to show that 
one of these methods of induction is less philosophical or exact 
Ieee ar a 
mee Tern 
re ¢ Col hesive Attraction, p- 364, ii ser., vol. iv. 
