6 SCHMIDT ON THE COMPARATIVE PHYSIOLOGY 



carefully from the abdomen, stermim, large branches of the 

 nerves, &c., exhausted them of the nutritive fluid by maceration 

 in water, and of the fat in the minute nervous twigs by alcohol 

 and aether ; the residue necessarily constituted the pure primitive 

 fibre. When dried at 266° F., and burnt in oxygen gas in a 

 small platinum vessel, it yielded as follows* : — 



a. Craw-fish, 

 Determination of the Ash. 

 0"360 of the substance gave 0*01 15 ash (pure phosphate of 

 lime) = 3 "194 per cent. 



Nitrogen. 



I. 0*349 of substance gave 0'819 ammonio-chloride of pla- 

 tinum = 15*22 per cent, nitrogen, 



II. 0"3845 of substance gave 0*915 ammonio-chloride of pla- 

 tinum = 15*34 per cent, nitrogen. 



Combustion. 



a. 0*7525 of substance gave 1*391 carbonic acid and 0*4655 



, fcarbon . . . 52*14l , 



water = -=^ , , ^ y per cent. 



Lhydrogen. . 7*10 J ^ 



b. 0*7165 of substance gave 1*331 carbonic acid and 0*4485 



r carbon . . . 52*39'~l . 



water = < > per cent. 



Lhydrogen. . y\Sj 



b. Cockchafer. 

 Determination of the Ash. 

 0*2435 substance gave 0*008 ash (phosphate of lime with a 

 little phosphate of magnesia and a trace of oxide of iron) = 3*285 

 per cent. 



Nitrogen. 



I. 0*378 substance gave 0*885 ammonio-chloride of platinum 

 = 15*20 per cent, of nitrogen. 



II. 0*367 substance gave 0*867 ammonio-chloride of platinum 

 = 15*34 per cen<". of nitrogen. 



Combustion. 

 a. 0*720 substance gave 1*335 carbonic acid and 0*4515 water 



fcarbon . . . 52*35"! 

 = '^ 1 1 w ^^ r per cent. 



Lhydrogen . 7 "20 J 



• Tlie nitrogen was estimated by Varrentrapp and Will's method. The cal- 

 culations, in tliis as in all the following analyses, are made after the deduction 

 of the ash. 



