1896. | NEW YORK ACADEMY OF SCIENCES. 153 
(2) Some species lose in vigor on repeated cultivation and 
become incapable of exhibiting certain of their characters, or 
finally die. 
(3) Some species gain in vigor on repeated cultivation, ex- 
hibiting certain characters more strongly or even acquiring new 
ones. 
The changes observed for the several species are arranged 
below in tabular form. 
Cultures which died.| Cultures becom-'Cultures constant.) Cultures becoming more 
ing less vigorous, vigorous, with more posi- 
their characters be- tive or new characters. 
coming less posi- 1. Gelatin is now lique- 
tive. fied. 
| | 25. The cells are more 
6 70 84 12. The color be-| 8 56 102 121 | firmly united. 
comes paler. | 39. Milk more quickly 
ZA ht 13. The color be-| 33 57 110 126 coagulated. 
comes white. | 40. The gelatin is now li- 
36 78 25. The growth is| 54 65 114 quefied, ete. 
less abundant. | 59. Nitrate more strongly 
3783 44, Nitrate no lon-| 55 81 i17 reduced. 
ger reduced. j | 62. Rosalic acid more 
68. The cells are quickly decolored. 
| shorter. |112. Milk more distinctly 
'70. Gelatin no lon- coagulated. 
ger liquefied. |120. Nitrate is now re- 
| duced. 
123. Lactose litmus agar 
finally made blue, in- 
stead of being simply 
reddened. 
STATED MEETING. 
April 20th, 1896. 
The Academy met with President Srevenson in the chair. 
Eighteen persons were present. 
The minutes of the last meeting were read and approved. 
The Secretary presented the nomination of Mr. E. E. Olcott 
for resident membership, and it was referred in due course to 
the Council. : 
The Section of Geology and Mineralogy then organized and 
listened to the first paper of the evening, by Mr. John D. Irving, 
on “ The Stratigraphy of the Browns Park Beds, Utah.” The 
paper will appear subsequently in the TRANSACTIONS. 
