We have a large con-servatory 80 feet long, 30 feet wide, 20 feet high, 6 feet from ground to the gutters, side ventilators, all the glass 6x8 inches, aspect northeast by southwest, with a slight slope in ground to the north, exposed to the winds. Heating aparatus to be at northeast end. 30 feet of southwest is to be used as grapery ; glass partition The house was built 30 years age and is in a tolerable state of preservation, so that my employer does not wish to have it taken down. The heating aparatus is entirely gone. Would you recomment this to be heated with steam or hot water ? Would like some heat in grapery. I know that the house will be difficult to heat properly. If steam, can you recommend any particular aparatus, or would a locomotive boiler answer? - J.

F. C, Philadelphia.

[The ideal heating system is one which uses both hot water and steam, as circumstances may require. Several apparatuses can be used for both systems. In any case, pipe the house essentially as if you were to use steam, for the ordinary steam pipes are better than the old-fashioned cast-iron pipes for hot water heating.

We suspect that you will find hot water preferable for your conditions, particularly as you have a grapery to heat. For heating apparatuses, consult our advertising columns. - Ed. Am. G].