Junk, L920] BOTANICAL EDUCATION 275 



received. As a rule, the germinal Lox) of such seed was much higher when retested after <it !nr 

 kiln-drying for 3 days at 40°C. or air-drying for three weeks at laboratory temperatui 

 Wheat, barley, and rye responded better to kiln-drying than to air-drying. Oats, on the other 

 hand, responded I letter to air-drying. The apparent condition of a sample frequently afforded 

 little or no index to its germination. Samples of seed which give a low germination in the 

 "as received" test should be retested after conditioning. In such cases the retest gives, as 

 a rule, a better index of the commerical value of the sample for seed purposes. — M. II. McKay. 



1890. Stead, Arthur. The sulphur requirements of crops. Agric. Jour. South Africa 

 10: 13-21. 1919. 



1591. Talmage, R. H. Intensive potato growing on Long Island. Potato Mag. 2': 9, 29. 

 8 fig. 1919. 



1592. Taylor, E. P. Uniformity of rules and regulations of potato seed certification. 

 Potato Mag. 2": 7, 21-23. 1 Jig. 1919. 



1893. Taylor, H. W. Tobacco seed beds. Rhodesia Agric. Jour. 16: 306-312. 1919. 



1S94. Todd, P. H. The cultivation of aromatic plants in the United States. Amer. Jour. 

 Pharm. 91: 437-441. 1919. — The author reviews the volatile oil industry, placing emphasis 

 on the development of this industry in the United States. A number of volatile oils are dis- 

 cussed as to the present sources, necessary climatic conditions, etc. During the past few 

 years the production of aromatic oils has increased to a very great extent in the United States. 

 The production of some of the principal volatile oils, as peppermint, spearmint, pennyroyal, 

 wintergreen and sweet birch, is not only sufficient for American needs but permits a large 

 exportation to foreign countries. It is intresting to note that in the case of peppermint, 

 about nine-tenths of the total world's supply is produced in a few counties of southern Mich- 

 igan and northern Indiana. In summarizing the prospects for home production the author 

 states that it would seem that in our vast country, with its variety of climates — hot, 

 cool, dry and humid — -and its endless varieties of soils and geological formations, a suitable 

 combination of soil and climate can be found for every perfume bearing plant of present im- 

 portance to the trade. The one single determining factor that will make successful culture 

 of these plants possible or impossible seems to be the element of labor. — Anton Hogstad, Jr. 



1895. Trueman, J. M. Silage crops other than corn. Agric. Gaz. Canada 6: 53S-539. 

 June, 1919. — Results of experiments carried on at the Nova Scotia Agricultural College for 

 the past 5 years indicate that a mixture of oats, peas, and vetches will produce a higher yield 

 than Indian corn. The average analysis of this mixture compared with immature corn shows 

 6.78 per cent more in dry matter and 58 per cent more protein. A satisfactory silage is made 

 of a mixture of these three crops. — 0. W. Dynes. 



1896. Wale, Bernard N. The removal of hedgerows. Jour. Bd. Agric. [London] 

 25: 1408-1424, 1919.— See Bot. Absts. 3, Entry 2068. 



1897. W«aterbury, H. E. Colorado stores her own potatoes. Potato Mag. 2 3 : 6-7, 29-30. 

 6 fig. 1919. — Construction of houses is described. — Donald Folsom. 



BOTANICAL EDUCATION 



C. Stuart Gager, Editor 



189S. A. B. R. [Rev. of: Van Tieghem, P. Elements de botanique. [Elements of 

 botany.] 5-ed. 8vo. Tome I, Botanique generale, revue et corrigee par J. Costantin; 

 xv -f- 619 p., 260 fig. Tome II, Botanique speciale, remanice et augmentee par L. Costantin; 

 xx 4- ?4S p., 326 fig. Masson: Paris, 1918.] Jour. Botany 57: 197-19S. 1919. 



