246 NO DIFFERENCE IN FORM, 



having been included in the collection of substances 

 which have been denominated debris and granular 

 matter. By the carmine fluid we can, however, dis- 

 tinguish particles of germinal matter from fat 

 granules, myelin particles, and debris. Nor are ob- 

 servations and experiments upon this most inte- 

 resting question concerning the nature of contagium 

 limited to cattle plague. Although this disease affords 

 in very many ways advantages for study far above 

 many other contagious maladies, and deserves on 

 many grounds the most thorough and extended 

 scientific investigation, no doubt many of the questions 

 of the greatest general interest may be successfully 

 worked out by studying other contagious maladies 

 affecting man or animals. 



No Difference to be detected in the Appearance of 

 different kinds of Living Matter. I have shown that 

 even with the aid of the highest powers of the micro- 

 scope no differences can be discerned between 

 bioplasm from the cell or elementary part of the 

 highest organism at any age or period of develop- 

 ment, and bioplasm of which the lowest simplest 

 being in existence is composed. A minute particle 

 of the germinal matter of an amoeba could not 

 be distinguished from a portion of a pus or mucous 

 corpuscle, or white blood-corpuscle, &c. Compare 

 Figs. 30, 32. p. 100 ; 52, 54*, p. 130 ; 120, 121, p. 148. 



It will probably strike many as very remarkable 

 that the highest magnifying powers hitherto placed at 



