22 THE ROYAL SOCIETY OF CANADA 



developed into true plants, on the twentieth day came to maturity, 

 and then Mucor was revealed with black and shining heads, no one 

 having planted it, but the seeds having fallen there by chance. 



Observation VI. 



On the first day of November, I infected another piece of the 

 melon with the seed of the capitate Aspergillus which has spherical 

 and glaucous heads. ^ On the fourth dav I observed no change. On 

 the evening of the eighth day, the surface of the melon had a granular 

 appearance similar to that already mentioned for the pear and the 

 skin of shagreen (sagri), so that, on account of the abundance of the 

 flakes of the investing down, it seemed like frost. On the thirteenth 

 day, the down had grown and come to its final perfection, for it put 

 forth heads and turned into plants of its own kind: and on the eigh- 

 teenth day it disappeared. Howbeit, on a portion of the infected 

 melon of very small extent which had not been inoculated with the 

 seed of Aspergillus, another kind of plant was produced which showed 

 itself clearly on the twenty-fourth day and came to maturity. It was 

 indeed the branched, grey Botrytis with round seeds.^ On the twenty- 

 seventh day, in certain places where the (capitate) Aspergillus already 

 on the eighteenth day had come to perfect maturity, there appeared 

 the very slender, white Aspergillus which is branched like Gramen 

 Dactyloides, and has round seeds.^ Both these plants had sprung 

 from seeds which had fallen on the piece of melon by chance. 



Observation VII. 



On the thirtieth day of December, I took a piece of the melon 

 and shaped it into a triangular pyramid.^ Then, choosing a piece of 

 a quince and also of an almost ripe pear, commonly called Spina, I 

 formed them into truncated pyramids, with their apices removed, 

 giving the piece of quince a pentagonal, and the piece of pear a hexa- 

 gonal base.^ On the individual faces of the pyramids, I sowed the 

 seeds of Mucor, Aspergillus, and Botrytis, keeping each kind separate, 



1 Probably Aspergillus glaucus Link. Vide Plate IV, Fig. D. (Micheli, Tab. 

 91, Fig. 1.) 



^ Probably Botrytis umbellata Fr. Illustrations loc. cit. 



^ Probably Pénicillium digitatum Sacc. Vide Plate IV, Fig. E. (Micheli 

 Tab. 91, Fig. 3.). 



^ Vide PI. IV, Fig. J. 



6 Vide PI. IV, Figs. K and L. 



