each volume contained a hundred plates, except the last, and these were engraved by james sowerby. only 30 copies of this set were issued, another 50 complete sets were reissued in 1845 by henry george bohn. the cost in 1830 was 620 pounds. the scarcity of the early first editions led to doubt of their existence, the rare book is at the higher end of trade. the inherent value has led the bodleian libraries to make available a digital scan of the complete set.