M'CRONE: HISTOLOGY OF MALVA. 267 



the winter season when all parenchyma cells are well filled 

 with starch, and there are large cells and tubes of mucilage 

 thickly scattered through the same tissue. There is also a 

 quantity of sugar distributed through the tissues. Grape 

 sugar is present in a considerable quantity in both the first 

 and second year's growth. The bark is much thicker than on 

 the stem, the cells in general are larger and the water tubes 

 are much larger. 



Botanical Laboratory, 

 University of Kansas. 



BIBLIOGRAPHY. 



Kuntze: Beitrage zur vergleichenden Anatomie der Malvaceae. 



2— Univ. Sci. Bull., Vol. IX, No. 19. 



