[Vor. 1 
178 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
TABLE II 
RESULTS OF THE 1912 EXPERIMENT 
(August 6, 1911—July 1, 1912.) 
Sol. 1* | Sol. 5 | Sol. 6| Sol. 7 |Sol. 8| Sol. 9 | Sol. 10 
(with |(with-|(with-| (with | (with-| (with | (with 
Organism comb. | out | ош c.n.) out с.п.) с.п.) 
nitrogen)| c.n.) | c.n.) с.п.) 
Chlamydomonas pisifor- 
mis Dill forma minor| ++ – і = |++++| = [4444/4444 
Spargo 
Chlorella sp., large form 
with clathrate chro-| +++ — - ++ - +++ ++ 
matophore 
Kirchneriella sp., a form 
without marked gela-| + - - ББ - 4- 4- 
tinous envelope 
Protosiphon botryoides x Е EN 
(Kütz.) Klebs ++ t t | +++ қ егі гі» eet ба ба ns 
Chlorococcum | humicola 22. _ 
(Nüg.) Rabenh. o4 TED. К-үеғжеғ 
Chlorella vulgaris Bey. | +++ | -t - ++ = 4- 4+4 
Stichococcus bacillaris 
Nae +++] - | - | +4 ] - |] - - 
Slight, fair, good, and splendid growths are respectively indicated by +, ++, 
+++, and ++++. Хо growth is indicated by -. 
*The mention of growth in solutions 2, 3, and 4 is omitted because growth dif- 
ferences were not marked. These solutions were introduced in each series in order 
to note the effect of steadily decreasing quantities of ammonium nitrate on the in- 
tensity of growth. 
ТА scarcely detectable growth developed in these cases which, however, disap- 
peared in all cases within a short time. The growth was so slight as to be notice- 
able only when the flasks were compared with others absolutely free from growth. 
growth being maintained for a very long time. Growth on the 
mannite-containing medium was usually slower in making its 
appearance, but, in general, remained healthy for a longer 
period of time than those on glucose or saccharose. With 
very few exceptions, growth appeared last on the purely syn- 
thetic medium, but was maintained in a state of vigor longer 
