304 MANUAL OP BOTANY 



Those cells again which have an unrestrained development 

 are frequently also far more extended in length. The cell 

 of which each filament of cotton is formed is sometimes as 

 much as one or two inches long. On the other hand, some of 

 the minute cells known as microbes or micro-organisms are not 

 more than ^■sitsi; of an inch in diameter. 



