James Ward, Psychological Principles, Cambridge, Cambridge University Press, 1918. 

In trying, then, to conceive our psychological individual in the earliest stages of development we must no picture him as experiencing a succession of absolutely new sensations, which, coming out of nothingness, admit of being strung upon the «  thread of consciousness » like beads picked up at random, or of being cemented into a mass like the bits of stick and sand with which the young caddis covers its nakedness.