CHE REFERENCE LIBRARY - ZetaTalk

PROPAGATION BY MEANS OF' SEEDS AND SPORES 19usually 3-h& stuK This shed screen is oftenest used for theprotection of tender plants, but it affords an exceedingly usefuland convenient place forthe storage of pots and boxesof slow-germinating seeds. A ] tmore elaborate shed screen, imade of lath or slats, and con- itaking seed-beds edged with FIG. 10. Shed screen for seeds andboards, is shown in Fig. 11.plsnt,s.Various frames and covers are employed for indoor seedage,designed to regulate atmospheric moisture and to controltemperature. They are more commonly employed in thegrowing of cuttings, and are therefore described in Chapter Y.Yariations in temperature exercise less influence on seedsthan variations in moisture. Yet. it. is important that the extremesof temperature be not great, especially in small, delicateFIG. II,Lnrge shed screen, with seed-beds.or weak seeds. Stwls will e~iduw greater extremes of tempcraturewhen dry thau when moist. This indicates thatgerminatin g seeds must. 1~ kept in a relatively uniform temperature.For this reason it. is poor practice to put seed-boxesin a wimlow in full sunlight. Partial or complete shade serveF