26 



bers were nevertheless consecutive, and 

 thus no space was left for insertions. 

 Supposing, for example, that you have 

 three presses standing together, numbered 

 i, 2, and 3, and respectively occupied by 

 Botany, Horticulture, and Agriculture, it 

 is clear that when your press of Botany 

 is full, you must either duplicate your 

 No. i, or commence your subject afresh 

 with No. 4. Mr. Watts, however, set his 

 numbers loose, leaving a set of spare num- 

 bers after each, for future employment, 

 proportioned to the probable extent of the 

 subject. Thus, in the case supposed, 

 while his Botany would still have been 1, 

 his Horticulture might have been 10, and 



labelled externally, but merely press-marked inside 

 the covers. When labels were introduced, at the 

 suggestion of Mr. Winter Jones, the printing of 

 the first set cost ^800. 



