69 



CHAPTER IV. 



On Injecting Blood Vessels, &c. 



IT has been generally, though erroneously, con- 

 sidered that a perfect injection of an animal cannot 

 be secured until the rigor mortis has passed away; 

 it is, however, indubitable that the most successful 

 injections have been made immediately after death. 



Dr. Beale 1 says: " I have found that most perfect 

 injections may be made before the muscular rigidity 

 begins, that is, within a few minutes after the death 

 of the animal. Most of my fine injections have 

 been made less than five minutes after death, and 

 in the case of very young animals, so complete has 

 been the injection of the capillary vessels, that 

 where the capillary has not been fully developed, 

 the injection has filled the pervious portion, and 

 has penetrated to the very spot where the tube was 

 commencing to be formed." This the author can 

 entirely corroborate. 



The ordinary process for injecting blood vessels 

 is with the syringe ; as this is a very delicate opera- 



" How to Work with the Microscope," fifth ed., 1880, p. 

 114. 



