HORTICULTURE. 45 



decrease the color of the flowers by hastening the growth and development. 

 Black spot of the rose appeared to develop very freely when the humidity of the 

 house was low. 



Observations made at the station indicate that most varieties of roses do well 

 on the heavy, rich, loam soil, but some varieties, such as My Maryland, may do 

 exceedingly well upon a soil containing a considerable proportion of sand. A 

 light, sandy soil, however, might require too frequent watering to be economical. 

 Directions are given for preparing rose soils, together with suggestions for the 

 use of fertilizers. In the work at the station the following amounts and forms 

 of nitrogen per 100 sq. ft. of bench surface have given good results at various 

 times : Dried blood, 5 to 8 lbs. ; dried fish, 7.5 lbs. ; cotton-seed meal, 10 lbs. ; and 

 nitrate of soda, 4 to 5 lbs. Acid phosphate applied at the rate of 4 lbs. per 100 

 sq. ft. of bench surface has been sufficient for the needs of the plants and has 

 caused no damage. Potash in the form of sulphate, which is considered the 

 safest to use under greenhouse conditions, has been used at the rate of 12 oz. 

 per 100 sq. ft. The use of lime for the correction of soil acidity was found to be 

 important, although it is not considered an element of plant food. The Killarney 

 rose is very susceptible to injury from soil acidity, while My Maryland is much 

 less susceptible. About 9.5 lbs. of ground limestone per 40 sq. ft. of bench sur- 

 face proved to be beneficial in experiments recently conducted at the station. 



This bulletin also includes a brief discussion of possible losses of plant food 

 in greenhouses, contributed by J. G. Lipman (pp. 43, 44), and suggestions 

 as to the purchase of fertilizers, contributed by C. S. Cathcart (pp. 46, 47). 



Rosa hugonis, a new hardy yellow rose from. China, D. Fairchild {Jour. 

 Heredity, 6 {1915), No. 9, pp. 429-432, figs. 2).— A descriptive account of this 

 Chinese yellow rose, which has been grown in this country less than 15 years. 

 In addition to being one of the earliest blooming roses, it has proven to be 

 perfectly hardy and a prolific bloomer. 



Roses and their cultivation, T. W. Sandeks {London: W. H. & L. Colling- 

 ridge, [1912], 9. ed., pp. 200, pis. 20, figs. 69).— In the present edition of this 

 work (E. S. R., 15, p. 873) the subject matter has been brought up to date, and 

 the new varieties introduced through the year 1912 have been included. 



Saxifrages or rockfoils, W. Irving and R. A. Malby {London: Headley 

 Bros., [1915], pp. XII +147, pis. 32, figs. 15). — ^A descriptive account of the 

 more important members of the saxifrage family with reference to their use 

 in rock gardens. Information is given as to the habitats and cultural require- 

 ments of the different species, the class to which they belong, and the hybrids 

 that have been bred from them. 



The text is illustrated with photographic reproductions in half-tone and color. 

 Tables of red, yellow, and white colored saxifrages or rockfoils are appended. 



List of perennials and shrubs for planting in Illinois {Trans. III. Hort. 

 Soc, n. ser., 48 {1914), PP- 24-35). — Lists are given of perennial flowers, shrubs, 

 and hardy vines adapted for planting in Illinois, including information relative 

 to method of propagation, relative hardiness, and desirability with reference 

 to foliage, flower, or fruit. 



Our mountain garden, Mrs. Theodore Thomas {Neio York: E. P. Button & 

 Co., 1915, 2. ed., pp. 244, figs. 24)- — A popular account of the author's experience 

 in developing an informal garden, including a list of shrubs, vines, flowers, and 

 weeds cultivated in the garden. 



Design in landscape gardening, R. R. Root and C. F. Kelley {New York: 

 The Century Co., 1914, pp. 12+278, pi. 1, figs. 65).— This work is based largely 

 upon lectures offered in the department of landscape gardening at the University 

 of Illinois. The introductory chapter discusses the elements of landscape design. 



