440 ELIOT R. CLARK AND ELEANOR LINTON CLARK 





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Fig. 7 A series of drawings showing the relationship of pigmented leuco- 

 cytes to lymphatics during the absorption of an injected globule of oleic acid 

 (soap). The globule was injected on May 17. The series of records were made 

 May 18. The opaque mass of soap is shown only in the first sketch. Leuco- 

 cytes A and F were seen to move away from the injected mass and to approach 

 the lymphatic. After remaining closely attached to the lymphatic for varying 

 lengths of time, they were seen to move away. Just before moving away they 

 became clear. In each case, as the leucocytes lost their pigment, a very few 

 small granules were seen inside the lumen of the lymphatic which had not been 

 previously noted, lym., lymphatic. Enlargement = 187x. Drawn with camera 

 lucida. 



Fig. 8 A series of records showing the relationship of leucocytes to lym- 

 phatics during the absorption of a small amount of yolk of egg. The first record 

 shown here was made three hours after the injection. The yolk of egg was in- 

 jected near the tip of a lymphatic sprout. Pigmented leucocytes / and F be- 

 came attached to the tip of the lymphatic and remained there for about ten 

 minutes, and then moved away. Just before wandering away from the lym- 

 phatic they became clear. Clear leucocytes B, Y and Z are shown approaching 

 the injected mass and taking up the small yolk globules. Leucocytes F and M 

 became pigmented after close contact with leucocyte H, which contained a large 

 amount of pigment and granules. Leucocyte E disintegrated during the obser- 

 vation. G remained in approximately the same position throughout the obser- 

 vation, lym., lymphatic. Enlargement = 168x. Drawn with camera lucida. 



