II. BOTANY AND HORTICULTURE. 369 



bath, they lose the property they had acquired from the 

 fingers. 6 J5, May 6, 1872, 1227. 



BREAD FUNGI. 



Rochard and Legros announce, as tlie result of their inves- 

 tiirations, that the different forms of mold which are devel- 

 oped upon bread do not represent any kind of epidemic ; and 

 only exhibit themselves when the bread is badly made with 

 inferior flour, or kept in unsuitable conditions. Bread thus 

 manufactured becomes a favorable soil for the development 

 of fungi, which may be of various colors, orange, green, etc. 

 The humidity and acidity of bread, and the keeping it in 

 dark places, are the most favorable causes of the development 

 of mold. 



Of the red mold of bread, the occurrence of which has 

 sometimes produced so much alarm, two forms have been ob- 

 served. The green spots in bread are sometimes caused by 

 As2yergillus glmicus sometimes by PenicilUum glaucum' Tlie 

 black spots which are very frequent, and which often unite 

 'the orange and green, depend upon the presence of Rhisoj^us 

 nigricans^ and sometimes with the addition oi Botrytis grisea. 

 3 B, XL., 223. 



GROWTH OF ALG^ IX AQUARIA. 



Charbonnier has called attention to what he states to be a 

 fact, that when aquaria are exposed to light, the glass some- 

 times becomes coated with green algae in the course of two 

 or three days, while at other times five or six, or even eight 

 or ten days are needed for the same result. He noticed that 

 every month the vegetation has its maximum of intensity at 

 the time of the full moon, while there is almost none of it at 

 the new mogn. '. At full moon a daily cleaning is needed, 

 whereas outside of this period even once or twice a week 

 will be sufficient. In explanation, he remarks that vegetable 

 germs lying at the bottom of the water are raised in sunlight 

 by the gas bubbles which they then give off, and which con- 

 tinue attached to them for some time. When night comes 

 on, the bubbles disappear, and the plants sink again, but if 

 there is strong moonlight, the production of gas- 'continues, 

 and they are kept floating ; hence the superabundance met 

 with at full moon. 18 A, 3Iarch 7, 1873, 599. 



Q2 



