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of such others as chlorine, sulphur, phosphorus, potass, 

 soda, lime, magnesia, iron, etc. Vast differences vitally 

 must be legitimately assumed for tissues that are so dif- 

 ferent chemically. But, in the fourth place, we have the 

 authority of the Germans for asserting that the cells 

 themselves and they now, to the most advanced, are 

 only protoplasm do differ chemically, some being 

 found to contain glycogen, some cholesterine, some pro- 

 togon, and some inyosin. Now such substances, let the 

 chemical analogy be what it may, must still be allowed 

 to introduce chemical difference. In the last place, Mr. 

 Huxley's analysis is an analysis of dead protoplasm, and 

 indecisive, consequently, for that which lives. Mr. Hux- 

 ley betrays sensitiveness in advance to this objection ; 

 for he seeks to rise above the sensitiveness and the ob- 

 jection at once by styling the latter " frivolous." Never- 

 theless the Germans say pointedly that it is unknown 

 whether the same elements are to be referred to the 

 cells after as before death. Kiihne does not consider 

 it proved that living muscle contains syntonin ; yet Mr. 

 Huxley tells us, in his Physiology, that " syntonin is the 

 chief constituent of muscle and flesh." In general, we 

 may say, according to Strieker, that all weight is put 

 now on the examination of living tissue, and that the 

 difference is fully allowed between that and dead tissue. 

 On the second clause now, or with regard to the ac- 

 tion of reagents, these must be denied to produce the 

 like result on the various forms of protoplasm. With 

 reference to temperature, for example, Kiihne reports 

 the movements of the amoeba to be arrested in iced 

 water ; while, in the same medium, the ova of the trout 

 furrow famously, but perish even in a warmed room. 

 Others, again, we are told, may be actually dried, and 



