HEAT UPON LIVING MATTER. “467 
are killed at 
Tissue elements of warm-blooded 
animal—Man : j : I1I° 
(Stricker and K ithne) 
Tissue elements of Plants—Urtica, 
Tradescantia and Vallisneria .  116$°-1184° 
(Max Schultze and Kiihne.) 
Eggs, F pees alae! and Bacteria 
germs. : : .  122°-140"" 
(Spallanzani, Liebig, 7. dsssb 
and others.) 
So far as can be ascertained by really scientific 
methods, free from all obvious possibilities of mis- 
representation, these are the temperatures which 
undoubtedly kill the different varieties of that 
common life-stuff known as Protoplasm — the 
“physical basis of life,” as it has been termed by 
Professor Huxley. That it should present this 
comparative unity in its behaviour towards heat as 
weil as to other physical agencies, is surely not in 
antagonism with the generally-approved biological 
doctrines, of which Professor Huxley has made 
himself the most celebrated exponent in this country, 
In his own forcible language he tells us as follows :* 
—“ Beast and fowl, reptile and fish, mollusc, worm, 
* “Lay Sermons,” pp. 126-129. 
