20 THE ROYAL SOCIETY OF CANADA 



lib. VI, pp. 292, 327, and 333, but far more exactly by Tournefort in 

 Comm. Ac. R. Sc, An. 1707, pag. 72. 



Observation II. 



On the fifth of November of the same year (1718) I took a piece 

 of Melon (Pepo oblongus, C.B. Pin., 311) about four inches long and 

 two inches wide and thick. Next, with a very soft brush, I collected 

 from some other place the seeds from the dark sparkling heads of 

 Mucor,^ I then smeared them on to the surface of the piece of melon 

 on one side only, and put it in a place in no wise exposed to wind or 

 sun. On the tenth of the same month, the infected part appeared 

 everywhere white and strewn with a very thin down, like white cotton, 

 which on the twelfth attained almost an inch in height and assumed a 

 greyish colour ; and some of the filaments of the down began to appear 

 with white heads. On the fourteenth, the other filaments bore heads 

 of the same kind. Finally, on the fifteenth, all the heads had become 

 black, and after that the seeds came to maturity. 



Observation III. 



With the seeds which had been produced in the heads of the 

 Mucor in the previous experiment, on the sixteenth day, I smeared 

 another portion of the same melon on one side, and on the other 

 side I placed the seeds of the capitate Aspergillus with glaucous heads 

 and rounded seeds.^ On both sides, within the same interval of time 

 as I have mentioned above, they sprang up, grew in the same manner 

 as before, and produced seed after their kind. When I had done this 

 several times, always using those seeds which each new crop of plants 

 produced in its turn, I still observed no difference in the plants which 

 sprang up. 



Observation IV. 



On the sixth day of December, I took another piece of the melon 

 of the same size and shape as before. In it I made five hollows, dis- 

 tinct from one another, and in them I placed a small piece of a fig in- 

 fected with Mucor whose black and shining heads were already ripe. 

 On the eighth day, many of the Mucor plants had bowed their heads; 



1 Probably Mucor Mucedo Linn. Vide Plate IV, Figs. A and B. (Micheli, 

 Tab. 95, Fig. 1.) 



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

 91, Fig. 1.) 



