[buller] presidential ADDRESS 21 



Others were lowered around the holes where they had deposited seeds. 

 Then, on the twelfth day, the whole surface of the piece of melon 

 appeared covered over by the Mucor which, on the eighteenth day of 

 the same month, brought its seeds to maturity. On the nineteenth 

 day of the month, on certain parts of the surface of the above men- 

 tioned piece of melon, there appeared a white down, but in other places 

 down of an ashen hue, arising from seeds which had fallen by chance 

 from elsewhere on the melon. On the twentieth day, these grew up 

 and one turned into Botrytis,^ branched, grey-coloured, with round 

 seeds; the other into the capitate Aspergillus^ with glaucous heads and 

 round seeds; but the black ones produced from seeds placed there by 

 us forthwith perished. 



Observation V. 



On the fourth day of November, I infected the sides of two pieces 

 of the same melon with the seeds of the Botrytis^ which was branched 

 and grey with round seeds. One of these pieces, I placed in a forcing 

 house; the other in a small room with the window open. On these 

 two pieces, on the seventh day, and on the same two sides which had 

 been covered by seeds, granules appeared everywhere, like those which 

 one may observe on the skin of what we commonly call shagreen (sagri) , 

 or rather a piece of pear which has been cut open for some days, but 

 more sparsely than these. On the eighth day, these grains developed 

 into very minute and almost imperceptible down, and especially those 

 which were observed on the piece of melon which had been placed in 

 the forcing house. On the evening of the ninth day, on both sides of 

 the pieces, this down had much increased, so much so that they ap- 

 peared as if covered with frost, or as it were by nitre which comes out 

 on walls. The upper part of each piece of melon which had not been 

 inoculated with the Botrytis seed was still intact. On the thirteenth 

 day, the down on both pieces, at the infected spots, had produced 

 heads which changed to a glaucous colour not differing from that of 

 the heads from which I took the seeds, while not even a tiny plant of a 

 second species of Botrytis or of Mucor had appeared. Howbeit, 

 on the upper part of the piece of melon not placed in the forcing house, 

 certain masses of white down had arisen, which on the eighteenth day 



1 Probably Botrytis umbellata, Fr. Vide Plate IV, Fig. G. (Micheli, Tab. 91, 

 Fig. 2.) 



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

 91, Fig. 1.) 



3 Probably Botrytis umbellata, Fr. Vide Plate IV, Fig. G. (Micheli, Tab. 91, 

 Fig. 2.) 



