PROTOPLASM AND PLANT-0ELL8. 



chemical tests some botanists have recognized the following 

 chemical substances in protoplasm : cytoplastin, the essen- 

 tial constituent of the cytoplasm; paralinin, the essential 

 constituent of the nuclear hyaloplasm; linin, of which 

 the fibrillar network of the nucleus is composed; chroma- 

 tin, of which the granules are composed; pyrenin, which 

 constitutes the bulk of the nucleoles; chloroplastin, of 

 which the green fibrils of the chromatophores are com- 

 posed; metaxin, which composes the more soluble remain- 

 der of the chromatophores. 



4. Living protoplasm possesses the power of imbibing 

 food in the condition of watery solutions. The water with 

 which plants are supplied in nature always contains a con- 

 siderable amount of soluble matter, most of which is good 

 food for protoplasm. The imbibition of watery food in- 

 creases the size of the protoplasm, 

 and this is one of the causes of 

 growth in plants. Commonly there 

 is a surplus of imbibed material, and 

 this is stored in the protoplasm in 

 the form of drops of greater or less 

 size (the so-called vacuoles), thus 

 adding still more to the distension of 

 the protoplasm mass. (Pig- 3, s.) 



5. The most remarkable property 

 of protoplasm is its power of moving. 

 Every mass of living protoplasm ap- 

 pears from observation to have the 



, „ n -,.,. J. Vm. 3.— A few young 



power under favorable conditions of ceils from the root of Fri- 



■^ , tillaria, showing proto- 



changing its form, shifting the po- plasm (p), vacuoles (s). 



° ° ' or and thm cell- walls (h). 



istions of its several parts, and in Magnified 550 times. 

 many instances of moving bodily from place to place. 



