( 313 ) 



Tlie coiiidiopliores agree so well with Wkhmer's description') and 

 with liis pictnre, also with reiiard to dimensions, Ihat the diagnosis 

 need not be doubted. 



The fruit-bodies appear as small globules having the colour of 

 fresh hazehuits ; their size is only about y^ mm. With feeble ma»- 

 nitication thej appear to be enclosed bv an envelope of small, round, 

 highly refractive, greenish globules, enclosing a dark body. The 

 globules on stronger magnification turn out to be mycelium cells 

 with a greatly thickened \vall, which remain joined by a few thin 

 threads. The body within is little transparent, deep red and irregularly 

 egg-shaped. It has a thin fragile wall, consisting of t\vo layers of 

 flat cells in wdiich a red pigment is fonnd. 



The space within is filled up with a dense web of colourless 

 hyphae, the contents of which are homogeneous and between wdiich 

 the asci are found. 



These are egg-shaped and have a very thin wall, which in mature 

 asci is difficult to observe, but which can easily l)e recognised in 

 immature ones still containing colourless spores. 



The mature spores, of which eight are found in each ascus, have 

 a deep red colour, which is turned blue by alkali (ammonia). They 

 liaA e the shape of convex lenses, the thickness of Avhich differs oidy 

 little from the diameter. Round the aequator a hyaline seam is found, 

 showing fine radial striae or folds. 



The perithecia consequently resemble those of Aspergillus nidulans 

 which ditfers, lio\vever, by wanting the ramified slerigmata. Also the 

 ascosj)ores with their radially striated seam are dilferent from those 

 of nidulans which show a groove. 



Terrestrial magnetism. — " Tim (bi'dujicld of jihf(///r/lc disitirlxmcc." 

 \\\ W. \AN Bemmklkn. vCommunicated by Dr. J. P. van dek 



Stok). 



In 1895 I published '^) the results of a research on the change in 

 magnetic force on days following large magnetic disturbances. 



By comparing the mean dailv force on a dav directlv following 

 a tlisturbance with the force some days after, a differential vector 

 was obtained directed chiefly South with a deflection to West or 

 East of rather constant azimuth for each station. 



1) C. Wehmkr. Die Pilzgalliing Aspergillii.s, (joiiOvc lOOl. p. 71. 

 ~) Meleorologisclie Zeitsciir. 1895, pg. 321. 



