1896.] 



Presents. 



279 



V. Solutions of haeniochroinogen (reduced haematin of Stokes) 

 exhibit an intense absorption band between h and Gr. The band has 

 the same position as bhe band of CO -haemoglobin, but is more intense. 

 With one part of haemochrornogen in 25,000 parts of water (the 

 stratum examined being 10 mm. thick), an intense absorption band 

 occupies the region between \410'0 and \430"0. From the examina- 

 tion of solutions of various strengths, it results that the mean ray 

 absorbed corresponds to A, 420*0. 



VI. The absorption of the extreme violet and ultra-violet by 

 methaemoglobin indicates that this body is the product of a partial 

 decomposition of the molecule of oxy-haemoglobin. 



VII. The band in the extreme violet (and ultra-violet), which is 

 characteristic of haemoglobin, its compounds, and certain of its iron- 

 containing derivatives, in no respect depends upon the iron in the 

 molecule. This conclusion is based (1) on the fact that none of the com- 

 pounds of iron, organic or inorganic, possess the property of producing 

 a definite absorption in the extreme violet or the adjacent ultra-violet ; 

 (2) upon the study of haematoporphyrin, a body derived from haematin 

 by the removal of the iron which this body contains. 



Acid solutions of haemotoporphyrin of extreme dilution exhibit an 

 absorption band between li and H. If the solution be slightly more 

 concentrated K is absorbed, and with increasing concentration of the 

 solution the absorption of the ultra-violet extends more and more. 

 Alkaline solutions of haematoporphyrin absorb the same spectral 

 region, but the intensity of the absorption is greater. 



VII E. Neither bilirubin, hydrobilirubin, nor urobilin present any 

 definite absorption band in the region of the spectrum where the 

 absorption band of haemoglobin and its derivatives occurs. 



Presents, February 13, 1896. 



Transactions. 



Adelaide : — "Royal Society of South Australia. Transactions. 

 Vol. XIX. Part 2. 8vo. Adelaide 1895. The Society. 



Belgrade : — Royal Servian Academy. Spomenik. No. 25. [Ser- 

 vian.'] 4to. Belgrade 1895 ; Glas. ]Nos, 49 — 50. [Servian.] 

 8vo. Belgrade 1895; Godishnak. 1894. [Servian.] 8vo. 

 Belgrade 1895. The Academy. 



Bergen: — Museum. Aarbog. 1894-95. 8vo. Bergen 1S96. 



The Museum. 



Cambridge, Mass. : — Museum of Comparative Zoology. Annual 

 Report of the Curator. 1894-95. 8vo. Cambridge 1895. 



The Museum., 



