100 
JOURNAL OF THE PLYMOUTH INSTITUTION. 
different genera of the animal kingdom ; by alliances between very 
varied animal phenomena — e.g. ague and Phthisis, &c. ; by gra- 
dations of type in the so-called i 1 diseased' ' deviation; such gradations 
not only being seen in different latitudes, but in the "overlapping" 
phenomena of varying types in one and the same latitude. 
Method. — The spirit and method of the philosophical geologist, 
or comparative philologist, must be extended to the study of the 
variations of the growth of animal texture and cells (e.g. Phthisis). 
It seems a "necessary truth" that living Being (plants, animals, &c.) 
is sustained, and yet also now evolving, of uniform and determinate 
series : deviations or failure of growth, have purely natural causes 
in defective physical composition of the body itself, and deficient 
physical co-ordination with Existences external to the body. 
Co-ordination. — What a greater entirety of physical relations, 
as on Dartmoor, can effect of just co-ordination of the parts of the 
body, so analogy {e.g. Iodine in Goitre, arsenic in skin changes, 
&c.) leads us to expect that small amounts of certain mineral 
elements will co-ordinate the formative forces, and the longevity 
of the lung tissues to the longevity of the other tissues of the 
body. The vital force is a corelatable "mode" and " affection " 
of matter and force; vast "force' 7 contained in small amounts of 
matter. In nature, Ague touches Phthisis ; Arsenic touches Ague 
and the Skin System of animals ; the Skin System has relation 
to Phthisis ; hence expectation that Arsenic, or its chemical 
isomorphs, may co-cordinate against Phthisis ; an analogy remote, 
but actual. Time must be allowed, and the vast involvements of 
nature remembered. 
Pure Air.— Remembering Dr. Angus Smith's proofs of the purity 
of air at the sea, and in sparsely -populated districts, and re- 
membering the slow but sure rates of increase of Phthisis, in 
atmospheres known to be impregnated, more or less, by organic 
and inorganic substances ; remembering also the alliance of Phthisis 
to fevers (ague), the experiments of Tyndall on "germ clouds' ' 
have a possible bearing. But, after all, as certain types of in- 
dividuals never will or can pass to Phthisis, so we aim to co-ordinate 
the vito-chemical composition of the body of those who we know 
do tend to Phthisis, and doing that, by perfecting the entirety of 
physical relations; and yet further seeking some mineral element 
which, if supplied, shall create the just co-ordination : a deeper 
generalization than that of " germs" as causes, is needed. 
