Bui. 66, Bureau of Chemistry, U. S. Dept. Agr. 



Plate I. 



Fig. 1 .—Fruit-pulp Cells, Apple. 30. 



Fig, 2. — Fruit-pulp Cells, Pear. \ so. 



I'li()t()grai)hs bv Burt.ui ,1. Ihnvani. 



