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APPENDIX. 
The New York World, of December 4th, 1878, in a leading article upon 
President Porter’s paper, makes the following remarks [Ed.] : — 
“ A little more than a year ago Professor Tyndall delivered an address 
before the Birmingham and Midland Institute, of which he was president, 
and in it— according to his custom of conveying to his audiences not only 
facts, but the deductions therefrom which seem to him legitimate — he 
presented the conclusions to which he had been led through his study of 
nature. To this address Dr. Noah Porter, the distinguished president of Yale 
College, replied on Monday last in the Victoria Institute, in London, in a 
paper which will be found elsewhere in to-day’s World. Dr. Porter touches 
the most sensitive part of scientific men who speak beyond absolute 
knowledge, and in doing so lashes over the Professor’s shoulders many a 
writer who sees in matter promises and potencies as fair as those of which Mr. 
Tyndall caught an apocalyptic vision in his celebrated Belfast address. 
From the doctrine of the correlation of the physical forces, Professor Tyndall 
had deduced the conclusion that the order and energy of the universe were 
inherent, and not imposed from without — ‘ the expression of fixed law, and 
not of arbitrary will ’ — so that all which exists, whether spiritual, mental, 
moral, or material, is subject simply to mechanical laws. The human body, 
according to the views of Professor Tyndall, is a mere machine, and therefore 
cannot generate force. This position is opposed by Dr. Porter, on the 
ground that within the human body the nerves perform work additional to 
any that is implied in either the generation or transformation of force, and 
that that work is seen in their additional function of directing force to the 
accomplishment of certain ends. In other words, he brings his argument to 
bear directly on the question whether, when the human body is considered 
as an entirety, something is not found acting within it in a way which shows 
that it is not simply a machine, but a living body, some of whose functions 
must lead us to believe that it is in part governed by something which is 
not matter, nor belongs in the category of the correlated forces, nor is a re- 
sultant of them all or of any of them — in short, whether mind and matter do 
not exist as separate entities, and the former does not act upon the latter 
within the compages of our flesh. Besides this, if, as Professor Tyndall is 
fond of insisting, strict science is now impossible unless the relations between 
phenomena can be expressed quantitatively and in numbers, he who holds 
that the body is simply a machine is bound to show that its laws can be ex- 
pressed and formulated mathematically -a position which no physiologist 
now dreams of attempting to maintain, since, as Du Bois .Raymond said six 
