Bui. 1082, U. S. Deot. of Agriculture. 



PLATE XVII!. 



PROSERPINE AND KEIZERKROON TULIP BULBS. 



Fig. 1. — Four cUunps of Proserpine dug from 8 to 9 centimeter bulbs set 1-1 to the row. All 

 flowered, but aU did not propagate. Fig. 2. — The same bulbs shown in Figure 1, cleaned and 

 separated. The variety reproduces poorly, which is the main reason for its comparatively high 

 price. Fig. .3. — Reproduction in Keizerkroon from 10 to 12 centimeter bulbs planted 14 to the 

 row. The bulbs were imported in tlie autumn of 191S and used for bedding. They were dug as 

 soon as the flowers had faded, heeled in to ripen, and were dug again early in Juie, 1919. The 

 results are for the 1920 crop when the bulbs had become normal, but probably had not repro- 

 duced as well as they would have done had they ripened properlv the previous "year. Fig. 4. — 

 Reproduction in Keizerkroon S-centlmeter normal bulbs which have been in" the country 10 

 years. This popular variety is not proUflc of increase. 



