THE MICROSCOPE. 25 



circulation beautifully. As soon as this rotation ceases the plant is 

 dead. 



In woody growth these cell walls become thickened and almost 

 solid, which gives strength to the forest trees and allows upright 

 growth. The life of vegetation is within itself: one portion may 

 die and the remainder may retain its function unimpaired. The 

 body may die, but the germ remain alive. In simple plant life a 

 portion may be separated and a distinct plant grow from the slip. 

 In compound vegetation there is really no necessary death, trees 

 are known to be 3000, some 5000 years old; they would never die 

 except from injury. Changeableness of seasons arrests growth, so 

 we have periodical growth, and the rings are formed plain enough 

 to be counted, and the great age of trees learned thereby. Rarely 

 more than one ring is formed in a season, but it varies in develop- 

 ment, the north and south side while not explained perfectly, mak- 

 ing a difference. A rapid growth is not as durable as one slower 

 and more compact. Every species has a uniform law, and may be 

 easily recognized the world over. The lecturer explained 

 the malformation of plants, both herbaceous and woody, and gave a 

 beautiful description of our giant trees in California. 



The audience was evidently pleased and instructed by the lec- 

 turer. After the completion of the lecture, his points were very 

 plainly and beautifully illustrated by a number of microscopes, 

 under which were placed various specimens of vegetation. 



Mr. Martindale's instrument showed the cyclosis, the circulation 

 around each cell being distinctly visible. 



Prof. Kain displayed desmids, Mr. Derousse a specimen of fern 

 leaf, Mr. Charles Bowdin a section of clematis. Dr. Brown a section 

 of our linden tree, Mr. De Lacour the honey comb structure, which 

 attracted the ladies on account of its beautiful color and formation; 

 Mr. William D. Clark displayed a specimen of volvox globator, and 

 Mr. William H. Morrison gleocapsa. 



All who attended were benefitted. 



