BLOOD. 231 



constituent of the blood-corpuscles) is as 75 : 100 or 1:1-5. 

 The proportion assigned by Lecanu is much the same, but ap- 

 proximates to the ratio 1 : 2; whereas Denis's proportion is 

 usually 1 : 3 and often higher. Denis's amount of fibrin is 

 larger than mine, but less than Lecanu' s, for if the mean of 

 the first 10 of his analyses be taken, the result is •24£. 



In the estimation of the coloming matter there are, as might 

 have been aiiticipated, considerable differences. The mean of 

 my two analyses gives it as 6*2 in 1000 parts of blood; and in 

 100 parts of hajmatoglobulin the average is 5-7. 



This quantity of colouring matter, when estimated, according 

 to my method, from an analysis of 8 — 12 grains of dried blood, 

 contains, moreover, htemaphsein and some fat ; in consequence 

 of the very small proportion in which the two latter occur, 

 (the former being frequently not more than from -14 to -3, 

 and the latter about -3 of a grain,) I seldom attempted their 

 separation unless I had reason to believe that a consider- 

 able quantity of hsemaphsein was present. The quantity of 

 htcmatin, in my two analyses, is therefore placed rather too high. 

 Lecanu estimates the hsematin in 1000 parts of blood at 2-27, 

 which is considerably less than half my average. This dif- 

 ference is owing partly to the circumstance of Lecanu's analyses 

 being made with blood-corpuscles not thoroughly deprived 

 of their fibrin, and which possibly retained a portion of 

 moisture, and partly to the fact that Lecanu, by working on 

 larger quantities, was enabled to remove all the hsemaphajin 

 and fat. The average quantity of peroxide of ii'on in Denis's 

 experiments amounted to -092, which would correspond (accord- 

 ing to my own and Lecanu's analyses,) with about 0*9 of 

 hsematin. 



From the 10 analyses of man's blood, the mean quantity of 

 blood-corpuscles is 15-85. Hence Denis perfectly agrees with 

 me in the consideration that the blood-corpuscles contain 5-7§ 

 of hsematin. 



I have not attempted any separation of the salts : Denis 

 has, however, in all his analyses, determined the carbonates, 

 phosphates, and chlorides. 



It results from his important and elaborate observations, 

 that although the relative proportions of the salts vary con- 

 siderably, the limits to which they ai'e restricted are not very 



