Much has been said and written as to the protective vahie of the 

 building materials commonly used in the construction of greenhouse 

 walls, but generally without facts or figures to substantiate the state- 

 ments. 



After the extended observations recorded above, we feel that we 

 have facts and figures which lead to the following 



CONCLUSIONS. 



1st. That on the inside of the wall, the lined board walls, filled 

 with shavings, give the best results, that with the hollow space being 

 but little less valuable. 



2d. That hollow brick and concrete walls are about equally valua- 

 ble in protecting from cold, but not equal to the framed and board 

 walls. 



REMARKS. 



As to the cost of construction there can be but little difference, and 

 the important question of durability can only be determined after ten 

 or fifteen years' service. 



GLAZING EXPERIMENT. 



Zinc /Strips hetioeen the joints in glazing Greenhouses. 



In tlie construction of a new greenhouse for experimental pur- 

 poses, a portion of the house was glazed with Gasser's Patent Zinc 

 Joints. These joints consist of zinc strips about one-half inch wide, 

 bent in form of the letter a*"Z"*b, the ends of the lights of glass 

 coming together on the opposite side of the vertical part of the letter, 

 as at a and b. This allows the glass to be laid flat on the sash bars, 

 with little or no cnance for the frost to act upon the putty as in 

 Inpped glass. No water can enter between the laps of the glass to 

 start it from place when frozen, and no air can possibly enter no 

 matter how strong the wind may blow. 



In glazing, the strips were simply dipped in linseed oil, and the 

 glass tacked in place with ordinary zinc points ; large points not 

 being needed as with lapped glass. As no laps were made there is a 

 saving of from 1-8 to 1-4 inch with each light of glass used. The 

 drip of water that runs down the glass inside was found to be no 

 more than with lapped glass. 



CONCLUSIONS. 



1. By the use of these strips there is a saving in glass. 



2. The glass is more easily laid. 



