This section is from the book "Commercial Gardening Vol2", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
This is a simple matter of considerable importance. Charge the boxes quite two-thirds their depth with soil, but avoid firming the soil to any considerable extent. Nearly all daffodils of the trumpet section send their root fibres down almost perpendicularly, and issuing spontaneously from the bulb will often prise themselves out if the soil be made too firm. By first making the soil moderately firm, then pressing the bulbs into it and firmly covering in, they are usually kept in position. Arrange the bulbs almost touching in the boxes, and so place them that the "nose" or apex is just belowT the level of the box. After placing in the surface soil make it quite firm by ramming.