We also see b}' table No. 2, that there was 179 lbs. more of coal 

 consumed in heating the west house than in heating the east one. 



It was observed that the circulation of the hot water in pipes over 

 the benches was more rapid and regular than where the pipes run 

 under the benches. This, however, might have been remedied, in a 

 measure, had the boilers bolh been set in a pit or cellar. In this 

 case, they were both placed only 2 feet Ijelow the level of the green- 

 house floor. 



EFFECT UPON THE GROWTH OF PLANTS. 



The results of observations upon the growth of plants placed in 

 these two houses are very marked and in fa\or of the under-bench 

 piping. 



Carnations. To determine this question the same number :and 

 kinds of plants were planted in the middle bench of both houses irad 

 treated, in every way, as to soil, watering and ventilation the same. 

 As the blossom buds neared maturity each one was counted and a 

 small tag attached, to show that it had been counted, so that anyone 

 might pick the blossoms and not trouble to recoid every one cut. 



This was done ever}' morning and the results of the winter's count 

 is as follows : 

 Total number of blossoms counted in over-bench pii)ed house, 4.372 



"• " '' " " " under-bench piped '■ 4,797 



A difference of 425 in favor of the under-benched piped house. 



Lettuce. The side benches of both houses were planted with 

 lettuce early in the winter and careful weekly observations made as 

 to the comparative growth. As there was more or less mildew in 

 both houses, no accurate weight of the crop could be given, but that 

 in the east or under- piped house was much the best, as were 

 also seedling plants of lettuce, cabbage and tomatoes planted later. 



Cuttings and Flower /Seeds. The same kinds of cuttings and flower 

 seeds were put into both houses and the results carefully noted. In 

 every case the cuttings rooted more quickly and the seeds germinated 

 more quickly and evenly in the under-piped house. 



It was found where nearly matured or budded plants were placed 

 iu the two houses, that the blossoms came out more quickly where 

 the pipes were over the benches than where under them. 



DISTRIBUTION OF THF HEAT. 



To determine the distribution of the heat through the houses by 

 these two methods of piping, weekly observations were made at 



