EMBRYO, SEED AND CARPEL IN THE DATE. 105 





tance during the development of the endosperm, where the 

 fixation seemed to lead to misinterpretation. 



Similarly the long exposure to copper acetate of material 

 containing oil results in the formation of a white, apparently 

 amorphous deposit in certain situations. In a few prepara- 

 tions, under conditions which I am unable to determine ex- 

 actly, beautiful dendritic masses of minute crystals have 

 appeared. In others, large numbers of pale green sphaero- 

 crystals have been found on cutting a section, which had 

 the appearance of being an oil-copper compound. Their 

 insolubility in suitable solvents seems to preclude this inter- 

 pretation. Nevertheless, these should be understood in order 



i 



to exclude completely sources of error, as it is not at all 

 unlikely that where oil is exposed to copper salts, the oil 

 would be reduced in amount. In the present case, the alco- 

 holic material was used as control. 



I am obliged to Professor R. H. Forbes and Dr. A. E. 

 Vinson for much assistance in the obtaining and preserva- 

 tion of material, and to my colleagues, Professor B. B. Rons 

 and Professor C. L. Hare, for criticisms from the chemical 

 point of view of certain interpretations. This study, begun 

 at the Arizona Agricultural Experiment Station, has been 

 largely prosecuted at the Alabama Agricultural Experiment 

 Station. 



STRUCTURE AND DEVELOPMENT. 



Organogeny of the fruit. Some account of the develop- 

 ment of the parts of the fruit will be necessary in order 

 to make evident the anatomical and histological changes 

 which take place during the time between pollination and 

 the final maturation of the fruit. The materials have been 

 examined, not w T ith the object of studying the cell-to-cell 

 minutiae of the embryology, but rather to follow the main 

 outlines of development of the embryo, seed and fruit, to- 

 gether with their nutritive inter-relations discoverable with 

 the methods at hand. 



The whole extent of the development of the date fruit 

 falls rather naturally into three periods: a, that extending 



from the time of pollination (Stage I, f. 2) until the endo- 



