EXPLANATION OF PLATE I. 



Fig. 1. Blood-corpuscles of men, birds, and amphibia. 



2. The formation of the blood-corpuscles, from Reichert. 



3. Urea precipitated from an alcoholic solution by nitric 



acid. 



4. Crystals produced in the alcohol-extract of blood 



devoid of urea, after the addition of nitric acid. 



5. Nitrate of urea from blood in morb. Brightii. 



6. Urea precipitated from an alcoholic solution, by 



oxalic acid. 



7. Crystals produced in the alcohol-extract of blood 



devoid of urea, after the addition of oxalic acid. 



8. Crystals of oxalic acid, resembling pure urea. 



9. Nitrate of soda. 



10. Crystalline groups of nitrate of urea, as it crystallizes 



from an alcoholic solution. 



11. Pus in blood. 



12. Chyle from the thoracic duct. 



PRINTILD BY C. AND J. A I) L A R I), 



IlAKTHOLOMhW CH>SE. 



