Abstract
Counts of platelets and erythrocytes performed almost simultaneously on samples of arterial, venous and cutaneous blood from the arm of 28 white d1 adults living in Philadelphia, revealed statistically significant differences between blood of different vessels, and from the winter to the spring. In the winter, the number of platelets in arterial and venous blood is significantly higher than in the spring; there are no significant differences between counts on cutaneous blood in the 2 seasons. In the winter, the number of platelets in arterial blood is significantly higher than in venous blood; it is also significantly higher in venous than in cutaneous blood. In the spring, there are no statistically significant differences between the means of platelet counts on blood from the 3 sources. There are no statistically significant differences between the erythrocyte counts in the 2 seasons.

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