THE BIOLOGY OF DAILY LIFE. 



genous) formation of red blood corpuscles at 

 first as small haemoglobin particles, but soon 

 growing into red blood corpuscles, in certain 

 cells of the subcutaneous tissue of young 

 animals. Malassez describes the red blood 

 corpuscles originating by a process of con- 

 tinued budding from the marrow cells. 



" The white corpuscles appear to be derived 

 from the lymphatic organs, whence they are 

 carried by the lymph into the circulating 

 blood." (Histology, p. 15 and 16.) 

 Our next quotation is taken from an article in 

 Quain's Dictionary. But to help the reader duly to 

 appreciate its high authority, I will give the opinion of 

 a writer in the Quarterly Review on the Dictionary 

 itself. " No dictionary of medicine so compendious, 

 and at the same time so authoritative, has yet appeared 

 in any language. One hundred and sixty writers con- 

 tribute an immense number of articles, varying in 

 length from a column or less to thirty pages." In fact, 

 it is one of the very highest authorities in human 

 language at the present day, and its contributors are 

 the leaders in their various departments. 



I give a long quotation from an article on the Blood : 



4< The source of the red corpuscles is of the 

 greatest pathological importance. In the 

 embryo the blood and blood-vessels are 

 developed from the same elements, and thus 

 the two structures in their physiological aspect 

 are essentially inseparable. In fully developed 

 blood the source of the red corpuscle is ob- 

 scure; but there can be no reasonable doubt that 

 it originates in the colourless corpuscle, and 



