WITH THE MICROSCOPE. 



319 



surface (cell-wall), d. Same as the last, but with a new centre of 

 growth (nucleus), now comparatively quiescent, but capable of 

 assuming active growth, appear- 

 ing in the germinal matter. If c 

 were exposed to unfavourable 

 conditions the whole would be de- 

 stroyed, but under similar circum- 

 stances the nucleus of d might 

 alone resist these influences, 

 and the conditions becoming 

 favourable, would grow and pro- 

 duce new elementary parts, although of the original mass all but 

 this small portion of the germinal matter had been destroyed, e. Thick 

 layers of formed material, the whole of which were at one time in the 

 state of germinal matter, f. Secondary deposits commencing to appear 

 amongst the germinal matter, as fatty matter is precipitated amongst the 

 germinal matter of the fat vesicle, g. Afurther stage of the same process. 

 //. Separate masses of secondary deposits, as in the starch-holding 

 vegetable cells. /. Deposition of formed material or secondary 

 deposit in successive layers on the inner surface of the original 

 capsule, spaces or intervals in which currents 'are continually setting 

 in opposite directions during the life of the germinal matter, being 

 left. k. Germinal matter and formed material which is granular, the 

 particles of which are becoming resolved into several substances, as 

 takes place in the elementary part of the liver (liver cells). /. For- 

 mation of fibres from germinal matter, m. Germinal matter belong- 

 ing to and taking part in the formation of the walls of a tube. 



383. False Cells can be made in many ways, and some so closely 

 resemble certain natural cells that it would be difficult or impos- 

 sible from mere microscopic examination to distinguish one from 

 the other. This has led a number of observers to conclude that the 

 cells formed in the living body are produced in the same way as these 

 false or artificial cells. These erroneous conclusions have received 

 considerable support, and they have been advanced in favour of the 

 dogma lately forced into considerable notoriety that the formation 

 of all living things is due to physical and chemical operations 

 only. 



It is really most remarkable that in these days clever men can 

 be found who will waste their time in attempting to prove that the 

 " cells " of which the textures of living beings are made up are 

 formed by physico-chemical operations alone. The general state- 

 ments which have been made have been refuted over and over 

 again, and yet each one who advocates this view, of course with 



