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great time with the Chinese cabbage (Brassica pekinensis) , 

 the seed of which I obtained from your Department. I 

 am sure you will be interested to hear a word about 

 It. It turns out to be a most fascinating plant for 

 the investigation of that type of sterility which I 

 have been calling physiological incompatibility. It is 

 especially favorable for such study for I can grow the 

 plants in pots and get them to bloom any time in the 

 year without heading up. I hope to publish a prelimi- 

 nary report on the plant sometime within the next 

 year. As for growing the Chinese cabbage in garden 

 culture, I found I could force them as one does early 

 head lettuce and get fine cabbages before the hot 

 season comes on. The plants were grown under glass 

 until ready for the second transplanting, when they 

 were put in the field. I also grew a crop late in 

 autumn and banked them with leaves so we had fine 

 heads to eat until New dear's dinner used up the last. 

 Four plants of the late crop failed to form heads. 

 These were left without protection and lived through 

 the winter. I shall be Interested to see what they do 

 this spring. Evidently they will bloom without forming 

 heads. My experience indicates that the plant can be 

 forced quite successfully in spring. Of course, in such 

 a plant as Chinese cabbage, the condition of incom- 

 patibility is not directly involved In the commercial 

 crop. It might, however, develop during the isolation 

 of certain strains to the extent of Interfering with 

 the maintenance of the strain. In plants in which the 

 fruit or the seeds constitute the commercial product, 

 and especially when the method of propagation Is vege- 

 tative, incompatibility may limit very much the product 

 as it does in so many of our fruits." - For photograph 

 of an interesting form of this vegetable see PI. 239. 



