83 



(irecnhouse walls (pp. 7-9). — The coiiipiiralivc ^'allle of different 

 l)iiil(lii!ii- materials as a protection a<i'ainst the weather was tested l)_v 

 l>uil(liiii>- ill a o-ivi'idioiise four sections, G feet long- by -i feet hig'h, as 

 folK)\vs: 



Section 1. Coiicrote ( lioseiidale ceuient, one part to three parts of sand). 



Section 2. Hollow brick, inches thick. 



Section."!. Framed hollow wall covered with lining boards, building paper and 

 sheathing on the outside, and the same without the paper on the inside. 



Se(ti<in \. Same as section 3, but the space was tilled with dry pine shavings. 



In eacli of these walls was made a space .5 inches wide aud 1 foot long ruu- 

 iiiiig to tile center, in which were jilaced thermonu'ters so ]irotected as not to be 

 atVecled by the inside temperature of the house. Other thermometers were 

 placed on tlie inside surface of the walls similarly protected fnmi inside 

 tcmpei'atures. 



The iii.-ide iiiid surface temperatures of each kind of walls from 

 Jauuarv D to March 1 are recorded in tables. The conclusions are: 

 ( 1 ) On the inside of the wall the lined board walls filled with shav- 

 ino-s o-ave the best result, that with the hollow space being but little 

 less valuable. (2) Hollow- brick and concrete walls afforded about 

 e(|ua! ])rotection from the cold, btif Avere not equal for this purpose 

 to tlie frame and board walls. The difference in the cost of construc- 

 tion of the four kinds of walls is slight, but their comparative dura- 

 liility can be determined only after ten or fifteen years' service. 



(rlazing ex-peTiinent (pp. 9, 10).^ — Zinc strips were used between 

 the joints in glazing a greenhouse with decidedly favorable results. 



Evaporated aulphur as a remedy for' rnildeiDS and insects hi areen- 

 JioHses (pp. 10-15). — ^From experiments at the Station and reports 

 from those who have used this remedy, evaporated sulphur is rec- 

 ommended for the destruction of rose-leaf blight {Acti/ionema 

 rosea), rose mildew {Erysiphe [Spha37'otheea'] pannosa)^ grape mil- 

 <Umv, chrysantliennnn leaf blight, and the red spider {Tetranychus 

 fclar'nis). Care nuist be taken to prevent the sulphur from taking 

 [\v('. It may be used also as an aid in preventing mildeAv on lettuce 

 (l*('roiiospoia (jariglifonnis), though in grooving this plant under 

 glass the main dependence nnist be upon securing the proiier condi- 

 tions of temperature, moistiir(% and plant food. 



(rroiring lettvee wider glass — Lettuce mildeio (pp. 11-1 4). — The 

 ex|)erience of the past ten years in growing lettuce in greeidiotises 

 leads the writer of this article to the opinion tluit in order to escape 

 the mildew lettuce must be grown at a low temperature, ranging from 

 85° to 40° at night aiul 50" to 70° during the day, with care to avoid 

 sudden extreme changes of tem])erature ; that an abundance of [)lant 

 food aud water must be tised; that the " drainage shoidd be good and 

 the watering done in the morning and on bright days only:"" and 

 thtit nitrates of soda and ])otash are \aluable in developing the vigor- 

 ous growth of leaves. 



TJw pi inn wart {Sphoeria morhoxa) (})p. 15, IG). — Kxperiments on 

 the black wart or l)lack knot of the plum were made with linseed oil, 

 turpentine, and kerosene applied with a small brush as soon as the 



