ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



649 



The apparatus is sufficient to completely fill the finest vessels of 

 the retina, spinal cord, &c. 



Fearnley's Constant-Pressure Apparatus* — The method of Ludwig 

 has always been acknowledged as superior to injecting by the syringe 

 except for the one great obstacle — applying the necessary pressure, 

 which had to be effected by elevating and depressing huge water- 



FiG. 117. 



bottles or by connecting the air-pressure bottle with a water-tap and 

 regulating the pressure as best one could, thus rendering the pressure 

 almost as uncertain and irregular as the thumb-pressure of the 

 syringe. Mr. W. Fearnley's method is to apply the pressure with an 

 ordinary Higginson's enema syringe (figs. 117 and 118). 



No practice is required with this simple contrivance beyond 

 introducing and tying in tho nozzle in the aorta. 



* Brit. Med. Joum., 1883, pp. 859-60 (2 figs.). 

 Ser. 2.— Vol.. IV. 



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