15 



time, tolerably explicit analyses of the blood. 



GAUBIUS surpassed them all in accuracy. 



ROUEL.LE, the younger, determined pretty dis- 

 tinctly the salts which are contained in it. HEW- 

 SON described with precision several of the quali- 

 ties of the blood. BUCQUET examined the con- 

 stituent parts of the cruor : and lastly, we have 

 from DEYEUX and PARMENTIER, in answer to 

 a prize-question from the Medical Society at 

 Paris, an explicit analysis of the blood, as well 

 in its healthy state, as in certain diseases. FoUR- 

 CROY and VAUQUELIN added, some years after- 

 wards, an investigation of the colouring matter of 

 the blood ; but all that we have gained, since the 

 excellent work of DEYEUX and PARMENTIER 

 was published, has almost only been the clearing 

 away of some errors, without much positive addi- 

 tional information. I have also attempted to give 

 a detailed analysis of the whole mass of the blood; 

 and, assisted as I have been by the improved state 

 of Chemistry in later times, I may perhaps have 

 succeeded somewhat better than most of my pre- 

 decessors, in tracing the constituent parts of the 

 blood, even such as were unknown to them ; and 

 also in determining in a more decided manner the 

 characters of those that were known ; so that in 

 any future analysis of other humours or parts of 



