MISSOURI BOTANICAL GARDEN BULLETIN 137 
regulated with sufficient accuracy in the average greenhouse, 
though sometimes, even in winter, it may be impossible to 
prevent an undesired rise in temperature. This rise tends 
to throw flowering stock ahead of, rather than behind, the 
schedule, as was the case with the chrysanthemums this 
season. While such disturbances are undesirable from the 
standpoint of the Garden, they are frequently disastrous for 
the practical grower in that they sometimes so hasten or 
delay flowering that plants in great demand for special short 
seasons are not in a salable condition at the proper time. 
Light is an important factor, since it may affect both the 
size and number of the blossoms, and the time of their 
opening. Dull, cloudy weather retards the opening of the 
flowers and frequently decreases their size, whereas bright 
weather tends to hasten flowering and increase the dimen- 
sions of the blossoms. The influence of dull weather is more 
perceptible in late fall and mid-winter than at any other time 
of the year. And, unfortunately, the condition is compli- 
cated by the fact that plants regularly develop very slowly 
at this period, more rapid growth not beginning until Janu- 
ary. This is evidenced by the fact that January or February 
seedlings sometimes surpass in growth those from seed sown 
early in December. 
A list of the plants to be exhibited during the present sea- 
son is Sisto: Slight variations in this schedule, due to 
conditions not under control, will be understood from the 
preceding paragraphs. Announcements of any necessary 
changes will be made in the Butietin. In addition to the 
plant names a few notes are given in connection with the 
individual varieties, indicating the time and method of 
propagation. 
December.—Five hundred Lorraine begonias, from leaf- 
cuttings of plants which flowered last winter; cuttings started 
in March. Six hundred solanums, from seed sown in April. 
Seven hundred poinsettias, grown from cuttings made in 
June. Five hundred stevias, from cuttings made in April. 
January.—Eight hundred cyclamen, from seed planted in 
August, 1913. Seedlings from this August’s sowing are 
now growing for display in January, 1916. One hundred 
and sixty azaleas, from stock which is kept from year to 
year. In St. Louis these plants require protection from too 
much sun. The fall buds may be made to blossom by rais- — 
ing the temperature of the house. Three thousand lily-of 
the-valley, grown from imported flower buds called “pips. 
