CHAP, ii.] 



RESPIRATION. 



591 



ca w ^ 10 CD 



FIG. 75. (After Preyer and Gamgee.) THE SPECTBA OF OXY-HJEMOGLOBIN IN 



DIFFERENT GRADES OF CONCENTRATION, OF (REDUCED) HAEMOGLOBIN AND OF 

 CARBONIC-OXIDE-EDEMOGLOBIN. 



1 to 4. Solution of Oxy-Haemoglobin containing (1) less than -01 p.c., (2) '09 p.c., 

 (3) -37 p.c., (4) -8 p.c. 



5. ,, (reduced) Haemoglobin containing about '2 p.c. 



6. ,, ,, carbonic oxide Haemoglobin. 



In each of the six cases the layer brought before the spectroscope was 1 cm. in 

 thickness. The letters (A, a &c.) indicate Fraunhofer's lines, and the figures wave- 

 lengths expressed in 100,000th of a millimeter. 



