THE CANADIAN HORTICULTURIST. 



269 



10. The Most Able Pomologist. — Do you 

 know of any one who is familiar 

 enough vrith varieties of apples groum 

 under different conditions to he able to 

 identify them ? C. E. Brown. 



There is no man living equal in 

 this respect to the late lamented Chas. 

 Downing. Probably Mr. P. C. Barry, 

 of Rochester, N. Y., is the most able 

 pomologist of the present time. 



11. Greenhouse and heating. — For a green- 

 house how far the depth in ground, 

 what width generally, what glass and 

 size is best to use, and what is the latest 

 heater ? r. N. Jamesoii, Whitby, Ont. 



REPLY BY DR. BEADLE. 



I must confess to being not a little 

 puzzled over this questions which yon 

 have sent to me for answer. The pro- 

 per answer hinges greatly upon the use 

 which Mr. Jameson wishes to make of 

 the structure, but of which he has not 

 given the slightest hint. I will take ic 

 for granted however that he wishes to 

 propagate plants, and reply accordingly. 



If the soil will admit of it he may 

 have the walls all in the ground, rising 

 above the surface just enouge to admit 

 of a few inches projection of the roof 

 so as to throw off the water. Such a 

 house can be heated much more econom- 

 ically than where the walls are above 

 the surface. In many soils it is im- 

 possible to go so deep because of water 

 in the ground. 



The interior width is most convenient 

 when made at ten feet, allowing two 

 feet for the walk and four feet for each 

 of the tables. 



I have used Chance's thick sheet 

 glass, eight by ten inches and found it 



perfectly satisfactory ; but if hail storms 

 are frequent at Whitby, it would be 

 better to use an extra thick quality. 



The latest heater is steam. I have 

 not tried steam and cannot therefore 

 give an opinion upon the merits of 

 steam heating from personal experience. 

 My greenhouses are heated with hot 

 water, but I have only a small range 

 of glass as compared with many florists, 

 especially in the United States. Our 

 horticultural periodicals have published 

 a good deal of late on the question of 

 steam versus hot water heating. From 

 my reading on the subject I am inclin- 

 ed to the opinion that for heating a 

 large establishment, especially in a cli- 

 mate subject to very great and sudden 

 changes of temperature, steam will 

 prove to be the safest, because a sudden 

 and extreme lowering of the thermom- 

 eter can be more speedily counteracted 

 in every one of the houses and in every 

 part of each house by steam than by 

 hot water. 



This matter of heating is largely a 

 question of the extent of surface to be 

 heated. A properly built flue will be 

 the most economical method of heating 

 a small area, where hard firing will not 

 at any time be needed. The danger of 

 setting the structure on fire, of cracking 

 the flue so as to allow gases to escape 

 from the burning fuel into the house, 

 and of having one end of the house too 

 hot and the other too cold, is always 

 present when a flue is relied upon to 

 heat any considerable amount of glass 



12. Grapes and Small Fruits tor Orillia. — 

 In your December Number please give 

 me the names oj four or five grapes, a 



