14 INTRODUCTORY SUGGESTIONS. 
sq. ft. of glass. If a variety of stuff is grown, twice the 
help is necessary. 
17. With hot water, 15 tons egg hard coal. 
One good man should give good results in two houses 
20 x 100 ft. 
18. I burn on an average 200 tons of hard coal per 
year to heat ten houses gx too ft., 8 ft. to ridge, and four 
houses 21 x 140 ft., 1o ft. to ridge. Temperature at 
night, 50° to 60°. 
I want one man to each 5,000 sq. ft., if there is little 
potting to do. 
19. In tomato growing, it costs me about $50 per year 
for such a house, with coal at $3.30 per ton. 
One spry workman should do the work in two tomato 
houses 20 x too ft. 
20. Two houses 20x 100 ft. of tomatoes will keep one 
man occupied. As usually heated hereabouts [‘‘ Carna- 
tion belt,’’ Chester county], the firing could be done by 
the same person if he is an interested participant in the 
crop returns. The tomato ranges are usually two or four 
houses heated with hot water circulation, and seldom 
require re-coaling during the night. 
21. I have had no experience with growing roses. With 
carnations | find that it takes about 5 tons (long) coal for 
1,000 feet of glass. Some winters rather more, but mostly 
less. I find it takes about this, no matter what system of 
heating is used (flue or hot water), if used with all care 
in both cases. But by using pea coal in our horizontal 
tubular boiler we effect a saving in cost, as it takes little 
or no more pea coal than it does broken or egg. 
In our business it takes about one man to 5,000 sq. ft. 
of glass, during the forcing season. 
NEw JERSEY— 
22. My rose house, 20x So ft., consumes about g or Io 
tons of coal yearly. 
Two houses, 20x too ft., are enough for one man in rose 
growing, and he should have a boy to assist him in busy 
