REACFION OF CELLS TO CROTON OIL 247 
region of the tail recorded at intervals shows that the lymphatic 
capillaries expand with an increase in the thickness of the tail 
and contract again when the tail resumes its normal dimensions. 
Absorption through the lymphatic is evidently active during 
inflammation and appears to increase with an increase in the 
amount of fluid present in the tissue outside. 
Fig. 15 Sketches showing the reactions of a lymphatic sprout within the 
area affected by the injected croton oil. In this specimen an edema developed 
after the extrusion of the globule. Records of the thickness of the tail at the 
point under observation were made by means of the fine-adjustment screw. A. 
Sketch made May 29th, 12:15 p.m., immediately after the injection. Thickness 
of the tail, 554. B.3 p.m. Wall of the lymphatic swollen and granular at the 
tip. Thickness of the tail, 66 4. 6. Lymphatic at 5:15 p.m. (globule extruded 
at 3:45 p.m.). Endothelial wall of lymphatic smooth and thin, lumen enlarged. 
Thickness of tal, 100 u. D. 6 p.m. Lymphatic not so wide, but still enlarged at 
the tip. Thickness of tail, 744. E. May 30th, 10 a.m. Lymphatic capillary is 
normal in size and contour, and has retracted. Thickness of tail 574. X 178. 
