172 Journal of Agricultural Research voi. ix, no. 6 
(e) Mononuclear curve. —The mononuclears were decreased at 
first, and later returned to normal. • Their behavior was quite similar to 
the lymphocytes. Figure i shows in detail the various curves for one 
animal following muscular exercise. 
C.—EFFECTS ON HEMOGLOBIN 
Boothby and Berry (2) found an increase in the percentage of hemo¬ 
globin, and this increase occurred only when the red corpuscles were 
Fig. i.—G raphs showing the detail of leucocytic changes in the blood of one pig following muscular 
exercise. 
increased. These changes did not occur unless there was marked per¬ 
spiration. These workers found the increase to vary between 7 and 11 
per cent. Schneider and Havens (7) found the changes in hemoglobin, 
on the whole, proportionate, but not always equal, to the increase in 
the number of red corpuscles. They found the increase to vary between 
3.5 and 10.9 per cent. 
In the pig we have found an average increase of 3.13 per cent after 
exercise. The increase was not consistent. The percentage was found 
to be higher in 8 cases, lower in 4, and even in 3. 
