HORTICULTURE. 443 



sui)i)lemenled by u dressiiif;; at the rate of 180 lbs. of uiuriate of potash and 

 360 lbs. of superphosphate per acre. 



Brief reference is also made to other investigations with sulphur. 



How sulphur stimulates plant growth, F. de Castella (Jour. Dept. Agr. 

 Victoria, 12 (1014), No. 5, pp. 2S9-291). — ^A review of the above investigation. 



Unusual methods of propagating nut trees, R. T. Morris {North. Nut 

 Growers Assoc. Proc, 4 (1913), pp. 4-3-48, fig. 1). — The author discusses a 

 number of unusual methods of propagating nut trees. 



When grafting the shagbark hickory with scion wood moi'e than one year old, 

 the author found that if a small side branch from old wood carries a large 

 terminal bud this bud will start promptly, providing care is taken to remove 

 vigorous stock sprouts. Scions 4, 5, and even 6 years of age have been used 

 with success. 



An inarch method was recently experimentally employed with success in 

 grafting hickories. In this method the scion is cut free from the parent plant 

 and the part below the inai'cli is inserted in a test tube or a small bottle con- 

 taining water. Whereas the use of chemicals in the water prevented the de- 

 velopment of unfavorable micro-organisms, they likewise interfered with the 

 union of stock and scion. It was found tliat the water can be kept in good 

 condition by inserting specimens of bladderwort (Utricularia). Two specimens 

 thus grafted in the summer were found to have made a good union in the fall. 

 The successful development of this method will be of special value in extend- 

 ing the grafting season. 



The author has also met with success in developing plants of the shagbark 

 hickory, beech, and hazel from adventitious root buds started in sand. With 

 the beech and hazel the buds started from various sized root segments, but with 

 the hickory the buds started best upon root segments more than 6 in. in length 

 and more than i in. in diameter. Hazels may be propagated from cuttings 

 similar to rose cuttings, but not so readily as with roses. 



Attention is also called to the development of seedlings grown from seed 

 secured from pistillate chinaquapin flowers, which were bagged to prevent 

 pollination. Subsequent check experiments indicate that the chinquapin will 

 develop nuts freely without pollen and that the bitteruut hickory, shagbark 

 hickory, and pignut will develop nuts sparingly without pollen. In advance 

 of microscopic examination of the ovules, this phenomenon is attributed to 

 parthenogenesis. 



Multiplication of fl.oral parts in the carnation, C. H. Connors (Proc. Soc. 

 Bort. Sci., 10 (1913), pp. 93-99).— The substance of this paper has been ab- 

 stracted from another source (E. S. R., 30, p. 644). 



Individuality in rose plants, M. A. Blake (Proc. Soc. Hort. Sci., 10 (1913), 

 pp. 133-144). — This comprises a study on the individuality of rose plants based 

 on data secured in a soil experiment with My Maryland roses, conducted for 

 a number of years at the New Jersey Stations (B. S. R., 30. p. 344). 



Sweet pea studies.— IV, Classification of garden varieties of the sweet 

 pea, A. C. Real (New York Cornell Sta. Bui. 342 (1914), pp. 217-360, pis. 23, 

 fig. 1). — In continuation of previous reports (E. S. R., 28, p. 641) descriptions 

 are given of a large ninnber of varieties of sweet peas being tested at the sta- 

 tion in cooperation with the American Sweet Pea Society. The author briefly 

 reviews the methods which have been previously employed in the classification 

 and description of varieties, and outlines the method of classification employed 

 in the present descriptions. 



The results previously noted relative to autumn and spring planting tests 

 (E. S. R., 25, p. 645) are briefly summarized here. A germination test of old 

 seed of a great many varieties conducted in 1910 indicated that white-seeded 



