28 SCIENCE BULLETIN, No. 9. 



growth had been obtained the two previous years by application of Mn, 

 according to the Author, may have partially exhausted the available plant 

 food, so as to bring about the need for a general fertiliser. 



OSCAR LOEW. (Landw. Jahrb., 1003, 32, 437.) Small amounts of MnSO 4 

 increased the yield, providing the manuring was normal, the effect varying 

 with the different families of plants. Crucifers seem more sensitive than 

 Gramme. In rice the relation of grain to straw was improved by Mn, as 

 well as the yield. 



OSCAR LOEW and SEIROKU HONDA. (Bull. Imp. Univ. Tokyo, 1904, 6, 126-130.) 

 MnSO 4 applied to Cryptomeria japonica more than doubled the weight of 

 the tree in eighteen months. 



OSCAR LOEW and SEIROKU HONDA. (Bull. Imp. Univ. Tokyo, 1904, G, 136-137.) 

 Joint application of Fe aud Mn had a distinct effect in increasing the yield 

 of flax, whilst separated had less effect. 



JOHN A. VOELCKER. (Journ. Itoy. Agr. Soc., England, 64 (1903), p. 348; 65, 

 (1904), p. 306.) In pot experiments the Author found a decrease in the 

 growth of wheat and barley by using MnI 2 , while nitrate and phosphate had 

 a good effect. Germination and sprouting were retarded by Mn 2 O 3 and 

 MnSO 4 , w r hile a deeper green and more luxuriant growth were obtained 

 with MnCl 2 . 



GABRIEL BERTRAND. (Compt. Rend., 1905, 141, 1255-57.) Soil was clayey, and 

 contained 0-057 per cent, of Mn soluble in HC1 (0-024 soluble in acetic 

 acid). Oats were grown in plots of 20 acres; to one was added MnSO 4 , at 

 the rate of 50 kilo per hectare. The gain \vas 17 per cent, of grain, and 

 26 per cent, of straw. The grain produced with Mn weighed 46-5 kilos per 

 hectolitre, without Mn 44 kilos. The grain of both plots contained the same 

 amount of Mn, 0-000004 per cent. 



BERTRAND and TIIOMASSIN. (Compt. Rend., 141, 1905, p. 1256.) Oats grown 

 in a soil containing 0-057 per cent. Mn gave a considerable increase in 

 yield when MnSO< was applied. The general appearances were the same in 

 both plots, but there was a notable difference in yield. 



STRAMPELLI. (Atti. 6 Congresso Internaz. Chimica Applic., 4, 1906, pp. 14-17.) 

 The Author reports considerable increases in the yield of various grains 

 by the use of MnSO 4 , MnCl 2 , MuO 2 . 



II. MICHAELS and P. DE HEEN. (Bull. Acad. Royale Beige., 1906, 286-289.) 

 Colloidal solutions of Mn have a slightly more stimulating effect on 

 germination of plants than similar solutions of tin. 



GIOVANNI SALOMONE. (Staz. Sperim. Agrarie Ital., 1906, 38, 1015-1024.) Small 

 quantities of Mn have a beneficial influence, large are toxic. . . . Small 

 quantites of MnI 2 exerted a favourable influence on germination of 

 cabbage and carrot seeds. 



JOHN A. VOELCKER. (J. Roy. Agric. Soc. England. 1905, 66, 206-211.) In the 

 case of wheat, soaking the seed in solution of Mn and FeSO 4 (no more than 

 2 per cent.) is beneficial to germination. K and Na silicates are beneficial 

 to wheat and barley. 



TOMIO KATAYAMA. (Bull. Imper. Coll. Agric. Univ. Tokyo, 100f, 7, 91-93.) 

 Whilst MnSO 4 (0-015 per cent.) gave with peas an increase of 50 per cent. 

 on straw and 25 per cent, on seed, in case of cereals the increase was only 

 10 per cent. 



MUNESHIGI NAGOOKA. (Bull. Coll. Agri. Imper. Univ. Tokvoo. 1906. 7, 77-81.) 

 Experiments with rice were repeated in 1904. MnSO 4 was applied at 

 different rates, from 30 to 170 kilos per hectare. The greatest gain was 

 with 77 and 107 kilos per hectare, .about 15 per cent. 



Aso. (Bull. Coll. Agr. Tokyo Imp Univ.. 1907, 7, 449-453.) Further experiments 

 with rice and MnCl 2 resulted in slight increase in yield, loss than former 

 years. Where Mn was used in addition to a liberal application of other 

 fertilisers, scarcely any effect was produced, while with soils which had 

 been continuously cultivated without a general manure it gave an increase 

 of 23-5 per cent. Summing up the results, Aso states : " On the manganese 

 plots the increase was relatively greatest w r here the manuring conditions 

 were less favourable." 



MOLINARI and LIGOT. (Bull. Agr. (Brussels), 23, 1907, p. 764.) The Authors 



conducted a series of pot experiments with oats, using a soil containing 



- from 0-01 to 0-07 per cent. Mu. In addition to a complete fertiliser, MnSO 4 



