148 JOUKNAL OF THE EOYAL HORTICULTURAL SOCIETY. 



IPPigration in Colorado. By C. W. Beach and P. J. Preston 

 (U.S.A. Dep. Agr., Off. Exp. Stns., Bull. 218, July 1910; map).— 



In this State there are still nearly twenty-five million acres unappro- 

 priated and unreserved, much of which is open to entry under the 

 land laws. About two million acres are Irrigated, and nearly another 

 million could be irrigated from existing canals. It is held that in 

 farming by irrigation the best returns are to be secured by the 

 individual effort of the small farmer, and the tendency is towards 

 smaller farms and more intense cultivation (p. 7). This bulletin givea 

 much detailed information as to the water resources of the State — 

 the amount of water escaping from the streams each year, with the 

 storage capacity of reservoirs, return seepage, and areas irrigated, 

 along some of the principal rivers (pp. 14-22). The rise and progress 

 of irrigation is traced to explain the development of modern adminis- 

 trative methods (pp. 23-28), and the present state of the law as regards 

 acquirement of water rights &c. (pp. 35 and 36). Estimates are given 

 of the cost of raising various crops, and the equipment and capital 

 required to establish a forty-acre irrigated fruit farm (pp. 40-48). 

 See Abstract on ''Irrigation Problems," B,.II.S. Journal for 

 December 1911 (vol. xxxvii. p. 464). — A. P. 



IvOPy Palm (Gartenfiora; vol. Ix. pt. xvi. pp. 365-7; 1 plate). — 

 Phytelephas macrocarpa, the ivory palm, is a native of South America. 

 It attains a height of 6 feet and is dioecious. The staminate flowers are 

 arranged in thousands on a long, thick, root-like stem; the pistillate 

 flowers are few in number. Vegetable ivory is obtained from the fruit. 

 These palms are scarcely worth growing under glass. — S. E. W. 



Kainit : its Physical Action on Soil. By Alfred J. Ewart (Jour. 

 Agr. Vict. p. 738; Nov. 1911). — Kainit, when applied to the soil in 

 large amounts, increases the conductive power of the soil for heat, and 

 hence keeps its temperature more uniform. Exactly how it acts is 

 not quite certain, but the application of kainit at the rate of 100 or \ 

 300 lb. to the acre was found in Germany to reduce the amount of | 

 frost. When applied in greater amounts it forms a crust on the i 

 surface of the soil and appears to render it liable to a greater variation 

 of temperature than before any was applied. These facts are of 

 interest because they show how complicated may be the action of any 

 manurial substance when applied to the soil. — C. H. H. 



Laburnum Adami, A Periclinal Chimaera. By Nienburg j 

 (Gartenfiora', vol. Ix. pt. xvii. pp. 369-71). — Buder has found additional ■> 

 proof that Lahurnum Adami is a periclinal chimaera. The cells of 

 Cytisus purpureus contain tannic acid; the cells of Lahurnum vulgare \ 

 do not. When a section of the leaf-stalk of Adami is treated with 

 potassium dichromate, the presence of the two kind of cells is clearly 

 seen under the microscope. — S. E. W. 



Landolphia Petersiana (Bot. Mag. t. 8389).— East Africa. 

 Family, Apocynaceae ; tribe, Plumerioideae. Shrub, climbing by I 



