53 4 Miscellaneous . 



Series A. — The amoeboid motion of the white blood-corpnscle. 

 The change of shape and motion with relation to the surrounding 

 stationary and identical fields is well marked. 



Series B. — This series shows the power of the white blood-cor- 

 puscle in forcing its way through a mass of red crenated and adherent 

 blood-corpuscles. 



Series C. — Is of marked interest; a white corpuscle has seized upon 

 a red cori)uscle, and a series of photomicrographs shows that it has 

 dragged it through a considerable distance in a field which is proved 

 to be stationary and identical in all the photomicrographs. 



Series D. — This series shows motion in a red blood-corpuscle, 

 situated in a field in which the series proves no other motion took 

 place during one half-hour. This motion must therefore have been 

 produced by some inherent power in the red blood-corpuscle, and as 

 the photomicrographs show that no twist has occurred, the motion 

 cannot be due to a previous torsion, and may therefore be considered 

 a truly amoeboid motion of the red blood- corpuscle. 



Seiies E and F. — Show the diapedesis of the red blood-corpuscle 

 from a capillary in which the blood is in motion and from one in 

 which there is stasis of the blood. This phenomenon therefore occurs 

 under two opposite or nearly opposite conditions as regards intra- 

 vascular blood pressure, indicating perhaps that diapedesis is not a 

 filtration due to pressure, but is due to the amoeboid motion and 

 power of the red blood-corpuscles. 



Series G. — This series shows an empty capillary. Along the 

 inner surface of its wall may be seen white corpuscles, in which the 

 series indicates movement. The diapedesis of two red blood- 

 corpuscles from this empty capillary tends to strengthen the belief 

 in the amoeboid motion of the red blood-corpuscle. 



Further photomicrographs illustrate the position of the corpuscles 

 within the capillaries, and show the presence of nuclei in the red 

 corpuscles of the frog while in the living tissues. Different forms 

 of the malarial plasmodia and the application of the method to 

 pathological studies are illustrated by other photomicrographs. 



The pictures are not shown as the perfect results of this method 

 or as the outcome of reseai'ch by it. They are simply to illustrate 

 the author's method of studying cell-motion. Inferences based on 

 the pictures are foreign to the purpose of the communication, which 

 is intended merely to demonstrate a method of study worthy of 

 scientific consideration. Its usefulness in producing accurate illus- 

 trations, both for publication and for lantern-slides, cannot be over- 

 estimated, as it supplies pictures whose counterpart can be found 

 under the microscope. — Proc. Acad. Nat. Sci. Philad. Feb. 5, 1895, 

 pp. 38, 39. 



