Question Box 
Questions and Answers 
The question box, introduced by the 
secretary at the opening session was well 
patronized. The questions placed in the 
box were answered in part at one of the 
regular sessions and the remainder of 
them on the boat during the afternoon 
trip, Thursday, April 30th. 
Question i. Has coquina shell, which 
runs 40 to 70 per cent in lime in powdered 
form, been tried for lime? 
Mr. Hart: I do not think it would 
help, because shell disintegrates very 
slowly indeed. You can dig down in old 
Indian mounds, thirty feet deep, where 
the pottery is of the very oldest type, and 
yet the shells which are buried there are 
just as sharp on the edge as though they 
had just been opened. I think they would 
have to be burned some way to get the 
lime out of them. I don’t think it would 
be practicable. 
Mr. Street: I have seen the oyster 
shell burned and put on the ground. That 
has been clone about a mile from my place. 
Mr. Hart: I am speaking of the donac 
clam shell. The. oyster shell is excellent. 
Many claim it is even better than rock 
lime. 
Question 2. Is any commercial peach 
growing done in this State, and with what 
success ? 
Mr. Mace: We are out of the business 
entirely in our section. There are quite a 
good many grown around Seville section, 
but I cannot answer the question as to 
what success they are having. In our sec¬ 
tion we gav'e it up on account of the many 
pests that have grown up with it; scale, 
etc. The trees seem to have become very 
short lived, only living three or four 
years. 
Question 3. Why is there a slight 
exhibition of frost when our thermome¬ 
ters register 36 or 37 degrees? 
Mr. Hubbard: The reason for that is 
that the coldest air is on the surface of 
the ground, on a still night. When the 
air is in motion the temperature does not 
vary much. On a still night I have seen 
a thermometer ten feet from the ground 
register 42 degrees, while on the surface 
of the ground it registered 32 degrees. It 
is coldest at the surface of the ground and 
the temperature rises gradually as you go 
upward. 
Question 4. What is the cause of 
foot rot? What to do to prevent it? 
What is the cure? 
Mr. Hume: That is a good, healthy 
question. I see Prof. Rolfs coming around 
the corner, and I will get him on that. 
Professor Rolfs, you have two minutes 
to answer. (Laughter) 
Mr. Rolfs: Well, foot rot, according 
to Dr. Briosi, the Italian Plant Patholo¬ 
gist, is due to Fusarium limonis. Now, 
