1112 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Pinus Abies 35*53 per cent, and 41*23 per cent, respectively (equal to 

 1*08 per cent, and 0*66 per cent, of the total dry constituents). The 

 metal has been found in the ashes of oxydases, and also in a nucleo- 

 proteid extracted from Tea-leaves. Experiments made to prove the 

 action showed that 0*25 per cent, solutions of manganous sulphate were 

 poisonous to seedling Peas. On placing Barley seedlings in 0*01 

 per cent., after seven days they were yellow and had formed no 

 water roots ; in nine days some leaves began to flag. The extract 

 showed that they were exceptionally rich in oxydase and peroxydase. 

 This confirms Bertrand's discovery that the presence of Mn increases 

 the power of oxydases. Other experiments were made with normal 

 mineral solutions to which were added MnS0 4 , FeS0 4 with a trace of 

 iron, and the two salts respectively, 0*02 per cent, of either being the 

 strength. It was found that growth was favoured, especially at first, by 

 Mn ; it is suggested that the oxydases destroy products of metabolism 

 which hinder growth. The restriction of growth (elongation) in the 

 light may indeed be the effect of such hindering substances. — M. H. 



Crotalaria anagyroides. 



Nectaries, Extrafloral, and Water-secreting Calyx (Bcih. Bot. 

 Cent. bd. xiii. ht. 1, pp. 112-114). — Herr Fritz Noack gives a short 

 account of the honey-secreting stipules of Crotalaria anagyroides which 

 are visited by soldier-ants that keep off leaf-cutting ants and also large 

 animals. There is also an account of the water-secreting hairs in the 

 calyx of Datura suaveolens. — G. F. S.-E. 



Structure of Young Alg^:. 



(Edogonium, The Structure and Development of the Young- 

 Plants in. By F. E. Fritsch, B.Sc, Ph.D. (Ann. Bot. vol. xvi., No. 63, 

 p. 467, with three figures in the text). — The CEdogonia are green Alga? of 

 simple articulated filaments with cells marked with transverse striae at. 

 one extremity, and some may be found in the tubs or waters of any 

 garden. The intention of the paper is thus explained : " Although the 

 young plants of CEdogonium have not infrequently been figured in various 

 species, not many observations on their structure or mode of development 

 have been published. I propose therefore, in the present paper, to discuss 

 the structure of the young plants in five species of CEdogonium, obtained 

 from different parts of the Royal Gardens at Kew." Referring to (Ed. 

 cardiacv/m the author writes : " There is only a slight constriction at the 

 point at which the colourless root-end goes over into the chlorophyll- 

 containing part of the plant ; at this point, coinciding almost with the 

 former position of the cilia, I very frequently saw a ring of brown matter 

 extending right round the cell. I found considerable numbers of young 

 plants of QfJd. cardiacuvi with this type of base floating on the surface of 

 the water, and most of them exhibited a striking peculiarity. I found 

 that each of these was in intimate connection with an air-bubble of 

 variable size. The connection was not alone a mere cohesion, but a 

 closer examination showed that the otherwise spherical air-bubble was 

 drawn out to a distinct point of attachment, coinciding usually with the 



